Grade 11 Exam > Grade 11 Notes > Chemistry for Grade 11 > Past Year Paper with solution: Chemistry, 2019, Class 11
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Page 1 C B S E C l a s s – X I C H E M I S T R Y T i m e a l l o w e d : 3 h o u r s , M a x i m u m M a r k s : 7 0 G e n e r a l I n s t r u c t i o n s : a ) A l l t h e q u e s t i o n s a r e c o m p u l s o r y . b ) T h e r e a r e 2 6 q u e s t i o n s i n t o t a l . c ) Q u e s t i o n s 1 t o 5 a r e v e r y s h o r t a n s w e r t y p e q u e s t i o n s a n d c a r r y o n e m a r k e a c h . d ) Q u e s t i o n s 6 t o 1 0 c a r r y t w o m a r k s e a c h . e ) Q u e s t i o n s 1 1 t o 2 2 c a r r y t h r e e m a r k s e a c h . f ) Q u e s t i o n s 2 3 i s v a l u e b a s e d q u e s t i o n c a r r y i n g f o u r m a r k s . g ) Q u e s t i o n s 2 4 t o 2 6 c a r r y f i v e m a r k s e a c h . h ) T h e r e i s n o o v e r a l l c h o i c e . H o w e v e r , a n i n t e r n a l c h o i c e h a s b e e n p r o v i d e d i n o n e q u e s t i o n o f t w o m a r k s , o n e q u e s t i o n o f t h r e e m a r k s a n d a l l t h r e e q u e s t i o n s i n f i v e m a r k s e a c h . Y o u h a v e t o a t t e m p t o n l y o n e o f t h e c h o i c e s i n s u c h q u e s t i o n s . i ) U s e o f c a l c u l a t o r s i s n o t p e r m i t t e d . H o w e v e r , y o u m a y u s e l o g t a b l e s i f n e c e s s a r y . 1 . W h a t w i l l b e t h e v o l u m e o f a m m o n i a f o r m e d i f 2 L o f n i t r o g e n i s m i x e d w i t h 2 L o f h y d r o g e n a t c o n s t a n t t e m p e r a t u r e a n d p r e s s u r e ? A n s . 1 L o f n i t r o g e n w i l l r e a c t w i t h 3 L o f h y d r o g e n , 2 L o f n i t r o g e n w i l l r e a c t w i t h 6 L o f h y d r o g e n , b u t w e h a v e 2 L o f h y d r o g e n , t h e r e f o r e h y d r o g e n i s l i m i t i n g r e a c t a n t . S o , 3 L o f h y d r o g e n g i v e s 2 L o f a m m o n i a , 2 L o f h y d r o g e n g i v e s . 2 . G i v e t w o e x a m p l e s o f s t a t e f u n c t i o n s . A n s . H , t h e e n t h a l p y c h a n g e a n d U , t h e i n t e r n a l e n e r g y c h a n g e a r e s t a t e f u n c t i o n s a s t h e y d e p e n d o n i n i t i a l a n d f i n a l s t a t e a n d n o t e o n t h e p a t h . 3 . W h y t h e m o l a r e n t h a l p y o f v a p o u r i s a t i o n o f a c e t o n e i s l e s s t h a n t h a t o f w a t e r ? Page 2 C B S E C l a s s – X I C H E M I S T R Y T i m e a l l o w e d : 3 h o u r s , M a x i m u m M a r k s : 7 0 G e n e r a l I n s t r u c t i o n s : a ) A l l t h e q u e s t i o n s a r e c o m p u l s o r y . b ) T h e r e a r e 2 6 q u e s t i o n s i n t o t a l . c ) Q u e s t i o n s 1 t o 5 a r e v e r y s h o r t a n s w e r t y p e q u e s t i o n s a n d c a r r y o n e m a r k e a c h . d ) Q u e s t i o n s 6 t o 1 0 c a r r y t w o m a r k s e a c h . e ) Q u e s t i o n s 1 1 t o 2 2 c a r r y t h r e e m a r k s e a c h . f ) Q u e s t i o n s 2 3 i s v a l u e b a s e d q u e s t i o n c a r r y i n g f o u r m a r k s . g ) Q u e s t i o n s 2 4 t o 2 6 c a r r y f i v e m a r k s e a c h . h ) T h e r e i s n o o v e r a l l c h o i c e . H o w e v e r , a n i n t e r n a l c h o i c e h a s b e e n p r o v i d e d i n o n e q u e s t i o n o f t w o m a r k s , o n e q u e s t i o n o f t h r e e m a r k s a n d a l l t h r e e q u e s t i o n s i n f i v e m a r k s e a c h . Y o u h a v e t o a t t e m p t o n l y o n e o f t h e c h o i c e s i n s u c h q u e s t i o n s . i ) U s e o f c a l c u l a t o r s i s n o t p e r m i t t e d . H o w e v e r , y o u m a y u s e l o g t a b l e s i f n e c e s s a r y . 1 . W h a t w i l l b e t h e v o l u m e o f a m m o n i a f o r m e d i f 2 L o f n i t r o g e n i s m i x e d w i t h 2 L o f h y d r o g e n a t c o n s t a n t t e m p e r a t u r e a n d p r e s s u r e ? A n s . 1 L o f n i t r o g e n w i l l r e a c t w i t h 3 L o f h y d r o g e n , 2 L o f n i t r o g e n w i l l r e a c t w i t h 6 L o f h y d r o g e n , b u t w e h a v e 2 L o f h y d r o g e n , t h e r e f o r e h y d r o g e n i s l i m i t i n g r e a c t a n t . S o , 3 L o f h y d r o g e n g i v e s 2 L o f a m m o n i a , 2 L o f h y d r o g e n g i v e s . 2 . G i v e t w o e x a m p l e s o f s t a t e f u n c t i o n s . A n s . H , t h e e n t h a l p y c h a n g e a n d U , t h e i n t e r n a l e n e r g y c h a n g e a r e s t a t e f u n c t i o n s a s t h e y d e p e n d o n i n i t i a l a n d f i n a l s t a t e a n d n o t e o n t h e p a t h . 3 . W h y t h e m o l a r e n t h a l p y o f v a p o u r i s a t i o n o f a c e t o n e i s l e s s t h a n t h a t o f w a t e r ? A n s . I t i s b e c a u s e a c e t o n e h a s w e a k v a n d e r W a a l s ’ f o r c e s o f a t t r a c t i o n w h e r e a s w a t e r m o l e c u l e s h a v e s t r o n g h y d r o g e n b o n d i n g , t h e r e f o r e , v a p H 0 o f w a t e r i s m o r e . 4 . H o w m a n y e l e c t r o n s a r e p r e s e n t i n 1 6 g o f m e t h a n e ? A n s . 1 m o l e c u l e o f m e t h a n e = 6 + 4 = 1 0 e l e c t r o n s 1 6 o f m e t h a n e c o n t a i n s 1 0 x 6 . 0 2 2 x 1 0 2 3 e l e c t r o n s = 6 . 0 2 2 x 1 0 2 4 e l e c t r o n s . 5 . H o w m a n y g r a m s o f s h o u l d b e d i s s o l v e d t o m a k e 1 0 0 c c o f 0 . 1 5 M ? A n s . 1 0 0 0 c m 3 o f 0 . 1 5 M c o n t a i n s 0 . 1 5 m o l e s o f N a 2 C O 3 S o , 1 0 0 c m 3 o f 0 . 1 5 M w i l l c o n t a i n = = 0 . 0 1 5 m o l e s o f M o l a r m a s s o f 3 = 1 0 6 g = 0 . 0 1 5 1 0 6 = 1 . 5 9 g 6 . T h e s t a n d a r d s o l u t i o n o f N a O H c a n n o t b e p r e p a r e d b y w e i g h i n g . W h y ? A n s . S i n c e N a O H i s d e l i q u e s c e n t i n n a t u r e a n d a b s o r b s b o t h m o i s t u r e a n d c a r b o n d i o x i d e f r o m a i r . T h e a c c u r a t e w e i g h i n g i s n o t p o s s i b l e a n d n o t f e a s i b l e t o p r e p a r e s t a n d a r d s o l u t i o n o f N a O H b y w e i g h i n g . 7 . G i v e r e a s o n : “ A l t h o u g h g e o m e t r i e s o f a m m o n i a a n d w a t e r m o l e c u l e s a r e d i s t o r t e d t e t r a h e d r a l , b o n d a n g l e i n w a t e r i s l e s s t h a n t h a t o f a m m o n i a ” . O r W h y i s b e n z e n e e x t r a - o r d i n a r y s t a b l e t h o u g h i t c o n t a i n s t h r e e d o u b l e b o n d s ? A n s . I n c a s e o f a m m o n i a , o n l y o n e l o n e p a i r o f e l e c t r o n i s p r e s e n t a n d d u e t o r e p u l s i o n b e t w e e n l p – b p , t h e b o n d a n g l e b e t w e e n b o n d p a i r s i s 1 0 7 0 . I n c a s e o f w a t e r , t w o l o n e p a i r s Page 3 C B S E C l a s s – X I C H E M I S T R Y T i m e a l l o w e d : 3 h o u r s , M a x i m u m M a r k s : 7 0 G e n e r a l I n s t r u c t i o n s : a ) A l l t h e q u e s t i o n s a r e c o m p u l s o r y . b ) T h e r e a r e 2 6 q u e s t i o n s i n t o t a l . c ) Q u e s t i o n s 1 t o 5 a r e v e r y s h o r t a n s w e r t y p e q u e s t i o n s a n d c a r r y o n e m a r k e a c h . d ) Q u e s t i o n s 6 t o 1 0 c a r r y t w o m a r k s e a c h . e ) Q u e s t i o n s 1 1 t o 2 2 c a r r y t h r e e m a r k s e a c h . f ) Q u e s t i o n s 2 3 i s v a l u e b a s e d q u e s t i o n c a r r y i n g f o u r m a r k s . g ) Q u e s t i o n s 2 4 t o 2 6 c a r r y f i v e m a r k s e a c h . h ) T h e r e i s n o o v e r a l l c h o i c e . H o w e v e r , a n i n t e r n a l c h o i c e h a s b e e n p r o v i d e d i n o n e q u e s t i o n o f t w o m a r k s , o n e q u e s t i o n o f t h r e e m a r k s a n d a l l t h r e e q u e s t i o n s i n f i v e m a r k s e a c h . Y o u h a v e t o a t t e m p t o n l y o n e o f t h e c h o i c e s i n s u c h q u e s t i o n s . i ) U s e o f c a l c u l a t o r s i s n o t p e r m i t t e d . H o w e v e r , y o u m a y u s e l o g t a b l e s i f n e c e s s a r y . 1 . W h a t w i l l b e t h e v o l u m e o f a m m o n i a f o r m e d i f 2 L o f n i t r o g e n i s m i x e d w i t h 2 L o f h y d r o g e n a t c o n s t a n t t e m p e r a t u r e a n d p r e s s u r e ? A n s . 1 L o f n i t r o g e n w i l l r e a c t w i t h 3 L o f h y d r o g e n , 2 L o f n i t r o g e n w i l l r e a c t w i t h 6 L o f h y d r o g e n , b u t w e h a v e 2 L o f h y d r o g e n , t h e r e f o r e h y d r o g e n i s l i m i t i n g r e a c t a n t . S o , 3 L o f h y d r o g e n g i v e s 2 L o f a m m o n i a , 2 L o f h y d r o g e n g i v e s . 2 . G i v e t w o e x a m p l e s o f s t a t e f u n c t i o n s . A n s . H , t h e e n t h a l p y c h a n g e a n d U , t h e i n t e r n a l e n e r g y c h a n g e a r e s t a t e f u n c t i o n s a s t h e y d e p e n d o n i n i t i a l a n d f i n a l s t a t e a n d n o t e o n t h e p a t h . 3 . W h y t h e m o l a r e n t h a l p y o f v a p o u r i s a t i o n o f a c e t o n e i s l e s s t h a n t h a t o f w a t e r ? A n s . I t i s b e c a u s e a c e t o n e h a s w e a k v a n d e r W a a l s ’ f o r c e s o f a t t r a c t i o n w h e r e a s w a t e r m o l e c u l e s h a v e s t r o n g h y d r o g e n b o n d i n g , t h e r e f o r e , v a p H 0 o f w a t e r i s m o r e . 4 . H o w m a n y e l e c t r o n s a r e p r e s e n t i n 1 6 g o f m e t h a n e ? A n s . 1 m o l e c u l e o f m e t h a n e = 6 + 4 = 1 0 e l e c t r o n s 1 6 o f m e t h a n e c o n t a i n s 1 0 x 6 . 0 2 2 x 1 0 2 3 e l e c t r o n s = 6 . 0 2 2 x 1 0 2 4 e l e c t r o n s . 5 . H o w m a n y g r a m s o f s h o u l d b e d i s s o l v e d t o m a k e 1 0 0 c c o f 0 . 1 5 M ? A n s . 1 0 0 0 c m 3 o f 0 . 1 5 M c o n t a i n s 0 . 1 5 m o l e s o f N a 2 C O 3 S o , 1 0 0 c m 3 o f 0 . 1 5 M w i l l c o n t a i n = = 0 . 0 1 5 m o l e s o f M o l a r m a s s o f 3 = 1 0 6 g = 0 . 0 1 5 1 0 6 = 1 . 5 9 g 6 . T h e s t a n d a r d s o l u t i o n o f N a O H c a n n o t b e p r e p a r e d b y w e i g h i n g . W h y ? A n s . S i n c e N a O H i s d e l i q u e s c e n t i n n a t u r e a n d a b s o r b s b o t h m o i s t u r e a n d c a r b o n d i o x i d e f r o m a i r . T h e a c c u r a t e w e i g h i n g i s n o t p o s s i b l e a n d n o t f e a s i b l e t o p r e p a r e s t a n d a r d s o l u t i o n o f N a O H b y w e i g h i n g . 7 . G i v e r e a s o n : “ A l t h o u g h g e o m e t r i e s o f a m m o n i a a n d w a t e r m o l e c u l e s a r e d i s t o r t e d t e t r a h e d r a l , b o n d a n g l e i n w a t e r i s l e s s t h a n t h a t o f a m m o n i a ” . O r W h y i s b e n z e n e e x t r a - o r d i n a r y s t a b l e t h o u g h i t c o n t a i n s t h r e e d o u b l e b o n d s ? A n s . I n c a s e o f a m m o n i a , o n l y o n e l o n e p a i r o f e l e c t r o n i s p r e s e n t a n d d u e t o r e p u l s i o n b e t w e e n l p – b p , t h e b o n d a n g l e b e t w e e n b o n d p a i r s i s 1 0 7 0 . I n c a s e o f w a t e r , t w o l o n e p a i r s o f e l e c t r o n s a r e p r e s e n t . T h u s l p – l p r e p u l s i o n i s m o r e t h a n l p – b p . S o t h e b o n d a n g l e i s r e d u c e d t o 1 0 4 . 5 0 . O r T h e e x t r a - o r d i n a r y s t a b i l i t y o f b e n z e n e i s d u e t o r e s o n a n c e . D u e t o t h i s , t h e p e l e c t r o n c l o u d g e t s d e l o c a l i z e d r e s u l t i n g i n t h e s t a b i l i t y o f t h e m o l e c u l e . 8 . I n t h e e s t i m a t i o n o f s u l p h u r b y C a r i u s m e t h o d , 0 . 4 6 8 g o f a n o r g a n i c s u l p h u r c o m p o u n d a f f o r d e d 0 . 6 6 8 g o f b a r i u m s u l p h a t e . F i n d o u t t h e p e r c e n t a g e o f s u l p h u r i n t h e g i v e n c o m p o u n d . A n s . M a s s o f o r g a n i c c o m p o u n d = 0 . 4 6 8 g M a s s o f f o r m e d = 0 . 6 6 8 g 2 3 3 g o f c o n t a i n s S = 3 2 g 0 . 6 6 8 o f c o n t a i n s S = 3 2 0 . 6 6 8 / 2 3 3 = 0 . 9 1 7 g % o f S = 0 . 9 1 7 / 0 . 4 6 8 1 0 0 = 1 9 . 5 9 % 9 . a ) I s i t p o s s i b l e t o a c h i e v e e q u i l i b r i u m b e t w e e n w a t e r a n d i t s v a p o u r i n a n o p e n v e s s e l ? b ) E x p l a i n y o u r a n s w e r a n d s a y w h a t h a p p e n s e v e n t u a l l y . A n s . N o . H e r e , t h e r a t e o f e v a p o r a t i o n i s s t i l l c o n s t a n t b u t s i n c e t h e m o l e c u l e s g e t d i s p e r s e d i n t o a l a r g e o p e n v o l u m e , t h e r a t e o f c o n d e n s a t i o n f r o m g a s t o l i q u i d s t a t e c a n n e v e r b e e q u a l t o t h e r a t e o f e v a p o r a t e s e v e n t u a l l y c o m p l e t e l y . 1 0 . H o w d o e s e l e c t r o n e g a t i v i t y v a r y i ) d o w n t h e g r o u p a n d i i ) a c r o s s t h e p e r i o d ? A n s . ( a ) E l e c t r o n e g a t i v i t y g o e s o n d e c r e a s i n g d o w n i n t h e g r o u p d u e t o i n c r e a s e i n a t o m i c s i z e . ( b ) I t g o e s o n i n c r e a s i n g a l o n g t h e p e r i o d d u e t o d e c r e a s e i n a t o m i c s i z e . 1 1 . G i v e r e a s o n s : “ T h e r e a c t i o n 2 N a ( s ) + H 2 ( g ) 2 N a H ( s ) i s a r e d o x c h a n g e ” . A n s . S i n c e i n t h e a b o v e r e a c t i o n t h e c o m p o u n d f o r m e d i s a n i o n i c c o m p o u n d , w h i c h m a y a l s o b e r e p r e s e n t e d a s N a + H – ( s ) , t h i s s u g g e s t s t h a t o n e h a l f r e a c t i o n i n t h i s p r o c e s s i s : Page 4 C B S E C l a s s – X I C H E M I S T R Y T i m e a l l o w e d : 3 h o u r s , M a x i m u m M a r k s : 7 0 G e n e r a l I n s t r u c t i o n s : a ) A l l t h e q u e s t i o n s a r e c o m p u l s o r y . b ) T h e r e a r e 2 6 q u e s t i o n s i n t o t a l . c ) Q u e s t i o n s 1 t o 5 a r e v e r y s h o r t a n s w e r t y p e q u e s t i o n s a n d c a r r y o n e m a r k e a c h . d ) Q u e s t i o n s 6 t o 1 0 c a r r y t w o m a r k s e a c h . e ) Q u e s t i o n s 1 1 t o 2 2 c a r r y t h r e e m a r k s e a c h . f ) Q u e s t i o n s 2 3 i s v a l u e b a s e d q u e s t i o n c a r r y i n g f o u r m a r k s . g ) Q u e s t i o n s 2 4 t o 2 6 c a r r y f i v e m a r k s e a c h . h ) T h e r e i s n o o v e r a l l c h o i c e . H o w e v e r , a n i n t e r n a l c h o i c e h a s b e e n p r o v i d e d i n o n e q u e s t i o n o f t w o m a r k s , o n e q u e s t i o n o f t h r e e m a r k s a n d a l l t h r e e q u e s t i o n s i n f i v e m a r k s e a c h . Y o u h a v e t o a t t e m p t o n l y o n e o f t h e c h o i c e s i n s u c h q u e s t i o n s . i ) U s e o f c a l c u l a t o r s i s n o t p e r m i t t e d . H o w e v e r , y o u m a y u s e l o g t a b l e s i f n e c e s s a r y . 1 . W h a t w i l l b e t h e v o l u m e o f a m m o n i a f o r m e d i f 2 L o f n i t r o g e n i s m i x e d w i t h 2 L o f h y d r o g e n a t c o n s t a n t t e m p e r a t u r e a n d p r e s s u r e ? A n s . 1 L o f n i t r o g e n w i l l r e a c t w i t h 3 L o f h y d r o g e n , 2 L o f n i t r o g e n w i l l r e a c t w i t h 6 L o f h y d r o g e n , b u t w e h a v e 2 L o f h y d r o g e n , t h e r e f o r e h y d r o g e n i s l i m i t i n g r e a c t a n t . S o , 3 L o f h y d r o g e n g i v e s 2 L o f a m m o n i a , 2 L o f h y d r o g e n g i v e s . 2 . G i v e t w o e x a m p l e s o f s t a t e f u n c t i o n s . A n s . H , t h e e n t h a l p y c h a n g e a n d U , t h e i n t e r n a l e n e r g y c h a n g e a r e s t a t e f u n c t i o n s a s t h e y d e p e n d o n i n i t i a l a n d f i n a l s t a t e a n d n o t e o n t h e p a t h . 3 . W h y t h e m o l a r e n t h a l p y o f v a p o u r i s a t i o n o f a c e t o n e i s l e s s t h a n t h a t o f w a t e r ? A n s . I t i s b e c a u s e a c e t o n e h a s w e a k v a n d e r W a a l s ’ f o r c e s o f a t t r a c t i o n w h e r e a s w a t e r m o l e c u l e s h a v e s t r o n g h y d r o g e n b o n d i n g , t h e r e f o r e , v a p H 0 o f w a t e r i s m o r e . 4 . H o w m a n y e l e c t r o n s a r e p r e s e n t i n 1 6 g o f m e t h a n e ? A n s . 1 m o l e c u l e o f m e t h a n e = 6 + 4 = 1 0 e l e c t r o n s 1 6 o f m e t h a n e c o n t a i n s 1 0 x 6 . 0 2 2 x 1 0 2 3 e l e c t r o n s = 6 . 0 2 2 x 1 0 2 4 e l e c t r o n s . 5 . H o w m a n y g r a m s o f s h o u l d b e d i s s o l v e d t o m a k e 1 0 0 c c o f 0 . 1 5 M ? A n s . 1 0 0 0 c m 3 o f 0 . 1 5 M c o n t a i n s 0 . 1 5 m o l e s o f N a 2 C O 3 S o , 1 0 0 c m 3 o f 0 . 1 5 M w i l l c o n t a i n = = 0 . 0 1 5 m o l e s o f M o l a r m a s s o f 3 = 1 0 6 g = 0 . 0 1 5 1 0 6 = 1 . 5 9 g 6 . T h e s t a n d a r d s o l u t i o n o f N a O H c a n n o t b e p r e p a r e d b y w e i g h i n g . W h y ? A n s . S i n c e N a O H i s d e l i q u e s c e n t i n n a t u r e a n d a b s o r b s b o t h m o i s t u r e a n d c a r b o n d i o x i d e f r o m a i r . T h e a c c u r a t e w e i g h i n g i s n o t p o s s i b l e a n d n o t f e a s i b l e t o p r e p a r e s t a n d a r d s o l u t i o n o f N a O H b y w e i g h i n g . 7 . G i v e r e a s o n : “ A l t h o u g h g e o m e t r i e s o f a m m o n i a a n d w a t e r m o l e c u l e s a r e d i s t o r t e d t e t r a h e d r a l , b o n d a n g l e i n w a t e r i s l e s s t h a n t h a t o f a m m o n i a ” . O r W h y i s b e n z e n e e x t r a - o r d i n a r y s t a b l e t h o u g h i t c o n t a i n s t h r e e d o u b l e b o n d s ? A n s . I n c a s e o f a m m o n i a , o n l y o n e l o n e p a i r o f e l e c t r o n i s p r e s e n t a n d d u e t o r e p u l s i o n b e t w e e n l p – b p , t h e b o n d a n g l e b e t w e e n b o n d p a i r s i s 1 0 7 0 . I n c a s e o f w a t e r , t w o l o n e p a i r s o f e l e c t r o n s a r e p r e s e n t . T h u s l p – l p r e p u l s i o n i s m o r e t h a n l p – b p . S o t h e b o n d a n g l e i s r e d u c e d t o 1 0 4 . 5 0 . O r T h e e x t r a - o r d i n a r y s t a b i l i t y o f b e n z e n e i s d u e t o r e s o n a n c e . D u e t o t h i s , t h e p e l e c t r o n c l o u d g e t s d e l o c a l i z e d r e s u l t i n g i n t h e s t a b i l i t y o f t h e m o l e c u l e . 8 . I n t h e e s t i m a t i o n o f s u l p h u r b y C a r i u s m e t h o d , 0 . 4 6 8 g o f a n o r g a n i c s u l p h u r c o m p o u n d a f f o r d e d 0 . 6 6 8 g o f b a r i u m s u l p h a t e . F i n d o u t t h e p e r c e n t a g e o f s u l p h u r i n t h e g i v e n c o m p o u n d . A n s . M a s s o f o r g a n i c c o m p o u n d = 0 . 4 6 8 g M a s s o f f o r m e d = 0 . 6 6 8 g 2 3 3 g o f c o n t a i n s S = 3 2 g 0 . 6 6 8 o f c o n t a i n s S = 3 2 0 . 6 6 8 / 2 3 3 = 0 . 9 1 7 g % o f S = 0 . 9 1 7 / 0 . 4 6 8 1 0 0 = 1 9 . 5 9 % 9 . a ) I s i t p o s s i b l e t o a c h i e v e e q u i l i b r i u m b e t w e e n w a t e r a n d i t s v a p o u r i n a n o p e n v e s s e l ? b ) E x p l a i n y o u r a n s w e r a n d s a y w h a t h a p p e n s e v e n t u a l l y . A n s . N o . H e r e , t h e r a t e o f e v a p o r a t i o n i s s t i l l c o n s t a n t b u t s i n c e t h e m o l e c u l e s g e t d i s p e r s e d i n t o a l a r g e o p e n v o l u m e , t h e r a t e o f c o n d e n s a t i o n f r o m g a s t o l i q u i d s t a t e c a n n e v e r b e e q u a l t o t h e r a t e o f e v a p o r a t e s e v e n t u a l l y c o m p l e t e l y . 1 0 . H o w d o e s e l e c t r o n e g a t i v i t y v a r y i ) d o w n t h e g r o u p a n d i i ) a c r o s s t h e p e r i o d ? A n s . ( a ) E l e c t r o n e g a t i v i t y g o e s o n d e c r e a s i n g d o w n i n t h e g r o u p d u e t o i n c r e a s e i n a t o m i c s i z e . ( b ) I t g o e s o n i n c r e a s i n g a l o n g t h e p e r i o d d u e t o d e c r e a s e i n a t o m i c s i z e . 1 1 . G i v e r e a s o n s : “ T h e r e a c t i o n 2 N a ( s ) + H 2 ( g ) 2 N a H ( s ) i s a r e d o x c h a n g e ” . A n s . S i n c e i n t h e a b o v e r e a c t i o n t h e c o m p o u n d f o r m e d i s a n i o n i c c o m p o u n d , w h i c h m a y a l s o b e r e p r e s e n t e d a s N a + H – ( s ) , t h i s s u g g e s t s t h a t o n e h a l f r e a c t i o n i n t h i s p r o c e s s i s : 2 N a ( s ) 2 N a + ( g ) + 2 e – a n d t h e o t h e r h a l f r e a c t i o n i s : H 2 ( g ) + 2 e – 2 H – ( g ) . T h i s s p l i t t i n g o f t h e r e a c t i o n u n d e r e x a m i n a t i o n i n t o t w o h a l f r e a c t i o n s a u t o m a t i c a l l y r e v e a l s t h a t h e r e s o d i u m i s o x i d i s e d a n d h y d r o g e n i s r e d u c e d , t h e r e f o r e , t h e c o m p l e t e r e a c t i o n i s a r e d o x c h a n g e . 1 2 . G i v e r e a s o n : ( i ) G r a p h i t e i s u s e d a s l u b r i c a n t . ( i i ) D i a m o n d i s u s e d a s a n a b r a s i v e . ( i i i ) A l u m i n i u m a l l o y s a r e u s e d t o m a k e a i r c r a f t b o d y . O r E x p l a i n i s o m e r i z a t i o n i n a l k a n e s w i t h e x a m p l e s . A n s . ( i ) G r a p h i t e h a s l a y e r e d s t r u c t u r e i n w h i c h t h e d i f f e r e n t l a y e r s a r e h e l d t o g e t h e r b y w e a k V a n d e r W a a l s f o r c e s a n d h e n c e c a n b e m a d e t o s l i p o v e r o n e a n o t h e r . S o , g r a p h i t e a c t s a s a l u b r i c a n t . ( i i ) S i n c e d i a m o n d i s v e r y h a r d , i t c a n b e u s e d a s a n a b r a s i v e . ( i i i ) A l u m i n i u m a l l o y s a r e l i g h t , t o u g h a n d r e s i s t a n t t o c o r r o s i o n a n d s o a r e u s e d t o m a k e a i r c r a f t b o d y . O r T h e n - A l k a n e s o n h e a t i n g i n t h e p r e s e n c e o f a n h y d r o u s a l u m i n i u m c h l o r i d e a n d h y d r o g e n c h l o r i d e g a s i s o m e r i z e t o b r a n c h e d c h a i n a l k a n e s . M a j o r p r o d u c t s a r e g i v e n b e l o w . S o m e m i n o r p r o d u c t s a r e a l s o p o s s i b l e b u t a r e n o t r e p o r t e d i n o r g a n i c r e a c t i o n s . C H 3 ( C H 2 ) 4 C H 3 C H 3 - C H ( C H 3 ) - ( C H 2 ) 2 - C H 3 + C H 3 - C H 2 - C H ( C H 3 ) - C H 2 - C H 3 1 3 . A n a l k y l h a l i d e c o m p o u n d ‘ A ’ ( C 5 H 1 1 B r ) r e a c t s w i t h e t h a n o l i c K O H t o g i v e c o m p o u n d ‘ B ’ , a n a l k e n e . ‘ B ’ o n r e a c t i o n w i t h b r o m i n e g i v e s c o m p o u n d ‘ C ’ . ‘ C ’ o n f u r t h e r d e h y d r o b r o m i n a t i o n g i v e s c o m p o u n d ‘ D ’ . W h e n o n e m o l e o f ‘ D ’ i s t r e a t e d w i t h s o d i u m m e t a l i n l i q u i d a m m o n i a , i t g i v e s o n e m o l e o f s o d i u m s a l t o f ‘ D ’ a n d h a l f a m o l e o f h y d r o g e n g a s . O n c o m p l e t e h y d r o g e n a t i o n , ‘ D ’ g i v e s a s t r a i g h t r e a c t i o n s i n v o l v e d . A n s . Page 5 C B S E C l a s s – X I C H E M I S T R Y T i m e a l l o w e d : 3 h o u r s , M a x i m u m M a r k s : 7 0 G e n e r a l I n s t r u c t i o n s : a ) A l l t h e q u e s t i o n s a r e c o m p u l s o r y . b ) T h e r e a r e 2 6 q u e s t i o n s i n t o t a l . c ) Q u e s t i o n s 1 t o 5 a r e v e r y s h o r t a n s w e r t y p e q u e s t i o n s a n d c a r r y o n e m a r k e a c h . d ) Q u e s t i o n s 6 t o 1 0 c a r r y t w o m a r k s e a c h . e ) Q u e s t i o n s 1 1 t o 2 2 c a r r y t h r e e m a r k s e a c h . f ) Q u e s t i o n s 2 3 i s v a l u e b a s e d q u e s t i o n c a r r y i n g f o u r m a r k s . g ) Q u e s t i o n s 2 4 t o 2 6 c a r r y f i v e m a r k s e a c h . h ) T h e r e i s n o o v e r a l l c h o i c e . H o w e v e r , a n i n t e r n a l c h o i c e h a s b e e n p r o v i d e d i n o n e q u e s t i o n o f t w o m a r k s , o n e q u e s t i o n o f t h r e e m a r k s a n d a l l t h r e e q u e s t i o n s i n f i v e m a r k s e a c h . Y o u h a v e t o a t t e m p t o n l y o n e o f t h e c h o i c e s i n s u c h q u e s t i o n s . i ) U s e o f c a l c u l a t o r s i s n o t p e r m i t t e d . H o w e v e r , y o u m a y u s e l o g t a b l e s i f n e c e s s a r y . 1 . W h a t w i l l b e t h e v o l u m e o f a m m o n i a f o r m e d i f 2 L o f n i t r o g e n i s m i x e d w i t h 2 L o f h y d r o g e n a t c o n s t a n t t e m p e r a t u r e a n d p r e s s u r e ? A n s . 1 L o f n i t r o g e n w i l l r e a c t w i t h 3 L o f h y d r o g e n , 2 L o f n i t r o g e n w i l l r e a c t w i t h 6 L o f h y d r o g e n , b u t w e h a v e 2 L o f h y d r o g e n , t h e r e f o r e h y d r o g e n i s l i m i t i n g r e a c t a n t . S o , 3 L o f h y d r o g e n g i v e s 2 L o f a m m o n i a , 2 L o f h y d r o g e n g i v e s . 2 . G i v e t w o e x a m p l e s o f s t a t e f u n c t i o n s . A n s . H , t h e e n t h a l p y c h a n g e a n d U , t h e i n t e r n a l e n e r g y c h a n g e a r e s t a t e f u n c t i o n s a s t h e y d e p e n d o n i n i t i a l a n d f i n a l s t a t e a n d n o t e o n t h e p a t h . 3 . W h y t h e m o l a r e n t h a l p y o f v a p o u r i s a t i o n o f a c e t o n e i s l e s s t h a n t h a t o f w a t e r ? A n s . I t i s b e c a u s e a c e t o n e h a s w e a k v a n d e r W a a l s ’ f o r c e s o f a t t r a c t i o n w h e r e a s w a t e r m o l e c u l e s h a v e s t r o n g h y d r o g e n b o n d i n g , t h e r e f o r e , v a p H 0 o f w a t e r i s m o r e . 4 . H o w m a n y e l e c t r o n s a r e p r e s e n t i n 1 6 g o f m e t h a n e ? A n s . 1 m o l e c u l e o f m e t h a n e = 6 + 4 = 1 0 e l e c t r o n s 1 6 o f m e t h a n e c o n t a i n s 1 0 x 6 . 0 2 2 x 1 0 2 3 e l e c t r o n s = 6 . 0 2 2 x 1 0 2 4 e l e c t r o n s . 5 . H o w m a n y g r a m s o f s h o u l d b e d i s s o l v e d t o m a k e 1 0 0 c c o f 0 . 1 5 M ? A n s . 1 0 0 0 c m 3 o f 0 . 1 5 M c o n t a i n s 0 . 1 5 m o l e s o f N a 2 C O 3 S o , 1 0 0 c m 3 o f 0 . 1 5 M w i l l c o n t a i n = = 0 . 0 1 5 m o l e s o f M o l a r m a s s o f 3 = 1 0 6 g = 0 . 0 1 5 1 0 6 = 1 . 5 9 g 6 . T h e s t a n d a r d s o l u t i o n o f N a O H c a n n o t b e p r e p a r e d b y w e i g h i n g . W h y ? A n s . S i n c e N a O H i s d e l i q u e s c e n t i n n a t u r e a n d a b s o r b s b o t h m o i s t u r e a n d c a r b o n d i o x i d e f r o m a i r . T h e a c c u r a t e w e i g h i n g i s n o t p o s s i b l e a n d n o t f e a s i b l e t o p r e p a r e s t a n d a r d s o l u t i o n o f N a O H b y w e i g h i n g . 7 . G i v e r e a s o n : “ A l t h o u g h g e o m e t r i e s o f a m m o n i a a n d w a t e r m o l e c u l e s a r e d i s t o r t e d t e t r a h e d r a l , b o n d a n g l e i n w a t e r i s l e s s t h a n t h a t o f a m m o n i a ” . O r W h y i s b e n z e n e e x t r a - o r d i n a r y s t a b l e t h o u g h i t c o n t a i n s t h r e e d o u b l e b o n d s ? A n s . I n c a s e o f a m m o n i a , o n l y o n e l o n e p a i r o f e l e c t r o n i s p r e s e n t a n d d u e t o r e p u l s i o n b e t w e e n l p – b p , t h e b o n d a n g l e b e t w e e n b o n d p a i r s i s 1 0 7 0 . I n c a s e o f w a t e r , t w o l o n e p a i r s o f e l e c t r o n s a r e p r e s e n t . T h u s l p – l p r e p u l s i o n i s m o r e t h a n l p – b p . S o t h e b o n d a n g l e i s r e d u c e d t o 1 0 4 . 5 0 . O r T h e e x t r a - o r d i n a r y s t a b i l i t y o f b e n z e n e i s d u e t o r e s o n a n c e . D u e t o t h i s , t h e p e l e c t r o n c l o u d g e t s d e l o c a l i z e d r e s u l t i n g i n t h e s t a b i l i t y o f t h e m o l e c u l e . 8 . I n t h e e s t i m a t i o n o f s u l p h u r b y C a r i u s m e t h o d , 0 . 4 6 8 g o f a n o r g a n i c s u l p h u r c o m p o u n d a f f o r d e d 0 . 6 6 8 g o f b a r i u m s u l p h a t e . F i n d o u t t h e p e r c e n t a g e o f s u l p h u r i n t h e g i v e n c o m p o u n d . A n s . M a s s o f o r g a n i c c o m p o u n d = 0 . 4 6 8 g M a s s o f f o r m e d = 0 . 6 6 8 g 2 3 3 g o f c o n t a i n s S = 3 2 g 0 . 6 6 8 o f c o n t a i n s S = 3 2 0 . 6 6 8 / 2 3 3 = 0 . 9 1 7 g % o f S = 0 . 9 1 7 / 0 . 4 6 8 1 0 0 = 1 9 . 5 9 % 9 . a ) I s i t p o s s i b l e t o a c h i e v e e q u i l i b r i u m b e t w e e n w a t e r a n d i t s v a p o u r i n a n o p e n v e s s e l ? b ) E x p l a i n y o u r a n s w e r a n d s a y w h a t h a p p e n s e v e n t u a l l y . A n s . N o . H e r e , t h e r a t e o f e v a p o r a t i o n i s s t i l l c o n s t a n t b u t s i n c e t h e m o l e c u l e s g e t d i s p e r s e d i n t o a l a r g e o p e n v o l u m e , t h e r a t e o f c o n d e n s a t i o n f r o m g a s t o l i q u i d s t a t e c a n n e v e r b e e q u a l t o t h e r a t e o f e v a p o r a t e s e v e n t u a l l y c o m p l e t e l y . 1 0 . H o w d o e s e l e c t r o n e g a t i v i t y v a r y i ) d o w n t h e g r o u p a n d i i ) a c r o s s t h e p e r i o d ? A n s . ( a ) E l e c t r o n e g a t i v i t y g o e s o n d e c r e a s i n g d o w n i n t h e g r o u p d u e t o i n c r e a s e i n a t o m i c s i z e . ( b ) I t g o e s o n i n c r e a s i n g a l o n g t h e p e r i o d d u e t o d e c r e a s e i n a t o m i c s i z e . 1 1 . G i v e r e a s o n s : “ T h e r e a c t i o n 2 N a ( s ) + H 2 ( g ) 2 N a H ( s ) i s a r e d o x c h a n g e ” . A n s . S i n c e i n t h e a b o v e r e a c t i o n t h e c o m p o u n d f o r m e d i s a n i o n i c c o m p o u n d , w h i c h m a y a l s o b e r e p r e s e n t e d a s N a + H – ( s ) , t h i s s u g g e s t s t h a t o n e h a l f r e a c t i o n i n t h i s p r o c e s s i s : 2 N a ( s ) 2 N a + ( g ) + 2 e – a n d t h e o t h e r h a l f r e a c t i o n i s : H 2 ( g ) + 2 e – 2 H – ( g ) . T h i s s p l i t t i n g o f t h e r e a c t i o n u n d e r e x a m i n a t i o n i n t o t w o h a l f r e a c t i o n s a u t o m a t i c a l l y r e v e a l s t h a t h e r e s o d i u m i s o x i d i s e d a n d h y d r o g e n i s r e d u c e d , t h e r e f o r e , t h e c o m p l e t e r e a c t i o n i s a r e d o x c h a n g e . 1 2 . G i v e r e a s o n : ( i ) G r a p h i t e i s u s e d a s l u b r i c a n t . ( i i ) D i a m o n d i s u s e d a s a n a b r a s i v e . ( i i i ) A l u m i n i u m a l l o y s a r e u s e d t o m a k e a i r c r a f t b o d y . O r E x p l a i n i s o m e r i z a t i o n i n a l k a n e s w i t h e x a m p l e s . A n s . ( i ) G r a p h i t e h a s l a y e r e d s t r u c t u r e i n w h i c h t h e d i f f e r e n t l a y e r s a r e h e l d t o g e t h e r b y w e a k V a n d e r W a a l s f o r c e s a n d h e n c e c a n b e m a d e t o s l i p o v e r o n e a n o t h e r . S o , g r a p h i t e a c t s a s a l u b r i c a n t . ( i i ) S i n c e d i a m o n d i s v e r y h a r d , i t c a n b e u s e d a s a n a b r a s i v e . ( i i i ) A l u m i n i u m a l l o y s a r e l i g h t , t o u g h a n d r e s i s t a n t t o c o r r o s i o n a n d s o a r e u s e d t o m a k e a i r c r a f t b o d y . O r T h e n - A l k a n e s o n h e a t i n g i n t h e p r e s e n c e o f a n h y d r o u s a l u m i n i u m c h l o r i d e a n d h y d r o g e n c h l o r i d e g a s i s o m e r i z e t o b r a n c h e d c h a i n a l k a n e s . M a j o r p r o d u c t s a r e g i v e n b e l o w . S o m e m i n o r p r o d u c t s a r e a l s o p o s s i b l e b u t a r e n o t r e p o r t e d i n o r g a n i c r e a c t i o n s . C H 3 ( C H 2 ) 4 C H 3 C H 3 - C H ( C H 3 ) - ( C H 2 ) 2 - C H 3 + C H 3 - C H 2 - C H ( C H 3 ) - C H 2 - C H 3 1 3 . A n a l k y l h a l i d e c o m p o u n d ‘ A ’ ( C 5 H 1 1 B r ) r e a c t s w i t h e t h a n o l i c K O H t o g i v e c o m p o u n d ‘ B ’ , a n a l k e n e . ‘ B ’ o n r e a c t i o n w i t h b r o m i n e g i v e s c o m p o u n d ‘ C ’ . ‘ C ’ o n f u r t h e r d e h y d r o b r o m i n a t i o n g i v e s c o m p o u n d ‘ D ’ . W h e n o n e m o l e o f ‘ D ’ i s t r e a t e d w i t h s o d i u m m e t a l i n l i q u i d a m m o n i a , i t g i v e s o n e m o l e o f s o d i u m s a l t o f ‘ D ’ a n d h a l f a m o l e o f h y d r o g e n g a s . O n c o m p l e t e h y d r o g e n a t i o n , ‘ D ’ g i v e s a s t r a i g h t r e a c t i o n s i n v o l v e d . A n s . 1 4 . C a l c u l a t e t h e a m o u n t o f a m m o n i a f o r m e d w h e n 5 0 k g o f N 2 ( g ) a n d 1 0 . 0 k g H 2 ( g ) o f a r e m i x e d t o p r o d u c e N H 3 ( g ) . I d e n t i f y t h e l i m i t i n g r e a g e n t . A n s . = 1 . 7 8 6 x 1 0 3 m o l = 5 . 0 x 1 0 3 m o l T h e n , t o i d e n t i f y t h e l i m i t i n g r e a g e n t 1 m o l e o f n i t r o g e n g a s r e a c t s w i t h 3 m o l e s o f h y d r o g e n g a s T h e r e f o r e 1 . 7 8 6 x 1 0 3 m o l o f n i t r o g e n w i l l r e a c t w i t h m o l e s o f h y d r o g e n = 5 . 3 6 1 0 3 m o l S i n c e , t h e r e i s 5 . 0 x 1 0 3 m o l o f h y d r o g e n o n l y , i t i s t h e l i m i t i n g r e a g e n t . T o c a l c u l a t e t h e a m o u n t o f a m m o n i a f o r m e d , 3 m o l e s o f h y d r o g e n g i v e s 2 m o l e s o f a m m o n i a , T h e r e f o r e 5 . 0 x 1 0 3 m o l e s o f h y d r o g e n g i v e s o f a m m o n i a = 3 . 3 1 0 3 m o l e s o f a m m o n i a . M a s s o f N H 3 p r o d u c e d = 3 . 3 1 0 3 1 7 g o f = 5 6 . 1 k gRead More
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FAQs on Past Year Paper with solution: Chemistry, 2019, Class 11 - Chemistry for Grade 11
| 1. What are some common chemical reactions studied in Class 11 Chemistry? |  |
Ans. Some common chemical reactions studied in Class 11 Chemistry include the combination reaction, decomposition reaction, displacement reaction, redox reaction, and acid-base reaction. These reactions are essential for understanding the principles and concepts of chemistry.
| 2. How can I balance chemical equations? | |
Ans. Balancing a chemical equation involves ensuring that the number of atoms of each element is the same on both sides of the equation. To balance a chemical equation, start by counting the number of atoms of each element on both sides. Then, adjust the coefficients in front of the reactants and products to balance the equation while following the law of conservation of mass.
| 3. What is the difference between a physical change and a chemical change? | |
Ans. A physical change is a change in which the substance's physical properties, such as shape, size, or state, are altered, but its chemical composition remains the same. On the other hand, a chemical change involves the formation of new substances with different chemical compositions. Chemical changes are usually accompanied by the release or absorption of energy.
| 4. How do I calculate the molar mass of a compound? | |
Ans. The molar mass of a compound is calculated by summing up the atomic masses of all the atoms present in the compound. To calculate the molar mass, multiply the atomic mass of each element by the number of atoms present in the compound, then add up the results. The unit of molar mass is grams per mole (g/mol).
| 5. What is the significance of the Avogadro's number in chemistry? | |
Ans. Avogadro's number, which is approximately 6.022 × 10^23, is a fundamental constant in chemistry. It represents the number of particles (atoms, molecules, or ions) present in one mole of a substance. The concept of Avogadro's number allows chemists to relate the mass of a substance to the number of particles it contains and perform various calculations in stoichiometry and other areas of chemistry.
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