Grade 11 Exam > Grade 11 Notes > Chemistry for Grade 11 > Past Year Paper with solution: Chemistry, 2017, 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 . I f a m e t a l i s h i g h e r t h a n a p a r t i c u l a r m e t a l i n e l e c t r o c h e m i c a l s e r i e s , w i l l i t b e s t r o n g e r r e d u c i n g a g e n t o r w e a k e r r e d u c i n g a g e n t ? W h y ? A n s . I t w i l l b e a w e a k e r r e d u c i n g a g e n t i f e l e c t r o c h e m i c a l s e r i e s h a s e l e m e n t s i n d e c r e a s i n g o r d e r o f t h e i r r e d u c t i o n p o t e n t i a l . 2 . I f t h e c r i t i c a l t e m p e r a t u r e f o r c a r b o n d i o x i d e a n d m e t h a n e a r e 3 1 . 1 0 C a n d – 8 1 . 9 0 C r e s p e c t i v e l y , t h e n w h i c h o f t h e s e h a s s t r o n g i n t e r m o l e c u l a r f o r c e s ? G i v e r e a s o n . A n s . T h e i n t e r m o l e c u l a r f o r c e s i n c a r b o n d i o x i d e a r e m o r e t h a n i n m e t h a n e m o l e c u l e s b e c a u s e o f g r e a t e r p o l a r i t y . 3 . W h i c h o f t h e s e c o n t a i n t h e l a r g e s t n u m b e r o f a t o m s – 1 . 0 g L i ( s ) a n d 1 g N a ( s ) ? A n s . 1 . 0 g L i . 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 . I f a m e t a l i s h i g h e r t h a n a p a r t i c u l a r m e t a l i n e l e c t r o c h e m i c a l s e r i e s , w i l l i t b e s t r o n g e r r e d u c i n g a g e n t o r w e a k e r r e d u c i n g a g e n t ? W h y ? A n s . I t w i l l b e a w e a k e r r e d u c i n g a g e n t i f e l e c t r o c h e m i c a l s e r i e s h a s e l e m e n t s i n d e c r e a s i n g o r d e r o f t h e i r r e d u c t i o n p o t e n t i a l . 2 . I f t h e c r i t i c a l t e m p e r a t u r e f o r c a r b o n d i o x i d e a n d m e t h a n e a r e 3 1 . 1 0 C a n d – 8 1 . 9 0 C r e s p e c t i v e l y , t h e n w h i c h o f t h e s e h a s s t r o n g i n t e r m o l e c u l a r f o r c e s ? G i v e r e a s o n . A n s . T h e i n t e r m o l e c u l a r f o r c e s i n c a r b o n d i o x i d e a r e m o r e t h a n i n m e t h a n e m o l e c u l e s b e c a u s e o f g r e a t e r p o l a r i t y . 3 . W h i c h o f t h e s e c o n t a i n t h e l a r g e s t n u m b e r o f a t o m s – 1 . 0 g L i ( s ) a n d 1 g N a ( s ) ? A n s . 1 . 0 g L i . 4 . P r e d i c t t h e s h a p e o f t h e P H 3 m o l e c u l e a c c o r d i n g t o V S E P R t h e o r y . A n s . T r i g o n a l p y r a m i d a l . 5 . G i v e r e a s o n : “ M e t a l l i c h y d r i d e s a r e u s e d f o r s t o r i n g h y d r o g e n ” . A n s . M e t a l l i c h y d r i d e s t r a p h y d r o g e n i n t h e i r v o i d s f o r m i n g i n t e r s t i t i a l h y d r i d e s , t h u s t h e y c a n b e u s e d f o r s t o r i n g h y d r o g e n . 6 . C o n v e r t : a ) C a r b o n t o b e n z e n e . b ) C a l c i u m c a r b i d e t o o x a l i c a c i d . A n s . 7 . H o w w o u l d y o u c a l c u l a t e t h e p H o f 0 . 0 0 1 M N a O H ? O r R a m e s h f o r g o t t o a d d t h e r e a c t i o n m i x t u r e t o t h e r o u n d b o t t o m e d f l a s k a t 2 7 o C b u t i n s t e a d h e p l a c e d t h e f l a s k o n t h e f l a m e . B u t a f t e r s o m e t i m e , h e r e a l i z e d h i s m i s t a k e a n d u s e d p y r o m e t e r a n d f o u n d t h e t e m p e r a t u r e o f t h e f l a s k w h i c h w a s 4 7 7 o C . W h a t f r a c t i o n o f a i r w o u l d h a v e b e e n e x p e l l e d o u t ? A n s . [ N a O H ] = [ ] = 0 . 0 0 1 M 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 . I f a m e t a l i s h i g h e r t h a n a p a r t i c u l a r m e t a l i n e l e c t r o c h e m i c a l s e r i e s , w i l l i t b e s t r o n g e r r e d u c i n g a g e n t o r w e a k e r r e d u c i n g a g e n t ? W h y ? A n s . I t w i l l b e a w e a k e r r e d u c i n g a g e n t i f e l e c t r o c h e m i c a l s e r i e s h a s e l e m e n t s i n d e c r e a s i n g o r d e r o f t h e i r r e d u c t i o n p o t e n t i a l . 2 . I f t h e c r i t i c a l t e m p e r a t u r e f o r c a r b o n d i o x i d e a n d m e t h a n e a r e 3 1 . 1 0 C a n d – 8 1 . 9 0 C r e s p e c t i v e l y , t h e n w h i c h o f t h e s e h a s s t r o n g i n t e r m o l e c u l a r f o r c e s ? G i v e r e a s o n . A n s . T h e i n t e r m o l e c u l a r f o r c e s i n c a r b o n d i o x i d e a r e m o r e t h a n i n m e t h a n e m o l e c u l e s b e c a u s e o f g r e a t e r p o l a r i t y . 3 . W h i c h o f t h e s e c o n t a i n t h e l a r g e s t n u m b e r o f a t o m s – 1 . 0 g L i ( s ) a n d 1 g N a ( s ) ? A n s . 1 . 0 g L i . 4 . P r e d i c t t h e s h a p e o f t h e P H 3 m o l e c u l e a c c o r d i n g t o V S E P R t h e o r y . A n s . T r i g o n a l p y r a m i d a l . 5 . G i v e r e a s o n : “ M e t a l l i c h y d r i d e s a r e u s e d f o r s t o r i n g h y d r o g e n ” . A n s . M e t a l l i c h y d r i d e s t r a p h y d r o g e n i n t h e i r v o i d s f o r m i n g i n t e r s t i t i a l h y d r i d e s , t h u s t h e y c a n b e u s e d f o r s t o r i n g h y d r o g e n . 6 . C o n v e r t : a ) C a r b o n t o b e n z e n e . b ) C a l c i u m c a r b i d e t o o x a l i c a c i d . A n s . 7 . H o w w o u l d y o u c a l c u l a t e t h e p H o f 0 . 0 0 1 M N a O H ? O r R a m e s h f o r g o t t o a d d t h e r e a c t i o n m i x t u r e t o t h e r o u n d b o t t o m e d f l a s k a t 2 7 o C b u t i n s t e a d h e p l a c e d t h e f l a s k o n t h e f l a m e . B u t a f t e r s o m e t i m e , h e r e a l i z e d h i s m i s t a k e a n d u s e d p y r o m e t e r a n d f o u n d t h e t e m p e r a t u r e o f t h e f l a s k w h i c h w a s 4 7 7 o C . W h a t f r a c t i o n o f a i r w o u l d h a v e b e e n e x p e l l e d o u t ? A n s . [ N a O H ] = [ ] = 0 . 0 0 1 M 8 . S t a t e t h e d i f f e r e n c e b e t w e e n c l a s s i c a l s m o g a n d p h o t o c h e m i c a l s m o g . A n s . C l a s s i c a l s m o g P h o t o c h e m i c a l s m o g O c c u r s i n c o o l h u m i d c l i m a t e . O c c u r s i n w a r m , d r y a n d s u n n y c l i m a t e . I t i s a m i x t u r e o f s m o k e , f o g a n d s u l p h u r d i o x i d e . C o m p o n e n t s o f p h o t o c h e m i c a l s m o g r e s u l t f r o m t h e a c t i o n o f s u n l i g h t o n u n s a t u r a t e d h y d r o c a r b o n s & o x i d e s o f n i t r o g e n p r o d u c e d b y a u t o m o b i l e s & f a c t o r i e s . 9 . G i v e n t h e e l e c t r o d e r e d u c t i o n p o t e n t i a l s o f f o u r m e t a l l i c e l e m e n t s A , B , C a n d D = + 0 . 7 9 , - 0 . 7 4 , 1 . 0 8 a n d – 0 . 3 1 V . A r r a n g e t h e s e i n o r d e r o f d e c r e a s i n g e l e c t r o p o s i t i v e c h a r a c t e r a n d s u p p o r t y o u a n s w e r . A n s . H i g h e r t h e e l e c t r o d e p o t e n t i a l l o w e r i s i t s t e n d e n c y t o l o s e e l e c t r o n s a n d t h e r e f o r e , l o w e r i s t h e e l e c t r o p o s i t i v e c h a r a c t e r o f t h e m e t a l . S o t h e m e t a l s a r e a r r a n g e d a s : B , D , A , C . 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 . I f a m e t a l i s h i g h e r t h a n a p a r t i c u l a r m e t a l i n e l e c t r o c h e m i c a l s e r i e s , w i l l i t b e s t r o n g e r r e d u c i n g a g e n t o r w e a k e r r e d u c i n g a g e n t ? W h y ? A n s . I t w i l l b e a w e a k e r r e d u c i n g a g e n t i f e l e c t r o c h e m i c a l s e r i e s h a s e l e m e n t s i n d e c r e a s i n g o r d e r o f t h e i r r e d u c t i o n p o t e n t i a l . 2 . I f t h e c r i t i c a l t e m p e r a t u r e f o r c a r b o n d i o x i d e a n d m e t h a n e a r e 3 1 . 1 0 C a n d – 8 1 . 9 0 C r e s p e c t i v e l y , t h e n w h i c h o f t h e s e h a s s t r o n g i n t e r m o l e c u l a r f o r c e s ? G i v e r e a s o n . A n s . T h e i n t e r m o l e c u l a r f o r c e s i n c a r b o n d i o x i d e a r e m o r e t h a n i n m e t h a n e m o l e c u l e s b e c a u s e o f g r e a t e r p o l a r i t y . 3 . W h i c h o f t h e s e c o n t a i n t h e l a r g e s t n u m b e r o f a t o m s – 1 . 0 g L i ( s ) a n d 1 g N a ( s ) ? A n s . 1 . 0 g L i . 4 . P r e d i c t t h e s h a p e o f t h e P H 3 m o l e c u l e a c c o r d i n g t o V S E P R t h e o r y . A n s . T r i g o n a l p y r a m i d a l . 5 . G i v e r e a s o n : “ M e t a l l i c h y d r i d e s a r e u s e d f o r s t o r i n g h y d r o g e n ” . A n s . M e t a l l i c h y d r i d e s t r a p h y d r o g e n i n t h e i r v o i d s f o r m i n g i n t e r s t i t i a l h y d r i d e s , t h u s t h e y c a n b e u s e d f o r s t o r i n g h y d r o g e n . 6 . C o n v e r t : a ) C a r b o n t o b e n z e n e . b ) C a l c i u m c a r b i d e t o o x a l i c a c i d . A n s . 7 . H o w w o u l d y o u c a l c u l a t e t h e p H o f 0 . 0 0 1 M N a O H ? O r R a m e s h f o r g o t t o a d d t h e r e a c t i o n m i x t u r e t o t h e r o u n d b o t t o m e d f l a s k a t 2 7 o C b u t i n s t e a d h e p l a c e d t h e f l a s k o n t h e f l a m e . B u t a f t e r s o m e t i m e , h e r e a l i z e d h i s m i s t a k e a n d u s e d p y r o m e t e r a n d f o u n d t h e t e m p e r a t u r e o f t h e f l a s k w h i c h w a s 4 7 7 o C . W h a t f r a c t i o n o f a i r w o u l d h a v e b e e n e x p e l l e d o u t ? A n s . [ N a O H ] = [ ] = 0 . 0 0 1 M 8 . S t a t e t h e d i f f e r e n c e b e t w e e n c l a s s i c a l s m o g a n d p h o t o c h e m i c a l s m o g . A n s . C l a s s i c a l s m o g P h o t o c h e m i c a l s m o g O c c u r s i n c o o l h u m i d c l i m a t e . O c c u r s i n w a r m , d r y a n d s u n n y c l i m a t e . I t i s a m i x t u r e o f s m o k e , f o g a n d s u l p h u r d i o x i d e . C o m p o n e n t s o f p h o t o c h e m i c a l s m o g r e s u l t f r o m t h e a c t i o n o f s u n l i g h t o n u n s a t u r a t e d h y d r o c a r b o n s & o x i d e s o f n i t r o g e n p r o d u c e d b y a u t o m o b i l e s & f a c t o r i e s . 9 . G i v e n t h e e l e c t r o d e r e d u c t i o n p o t e n t i a l s o f f o u r m e t a l l i c e l e m e n t s A , B , C a n d D = + 0 . 7 9 , - 0 . 7 4 , 1 . 0 8 a n d – 0 . 3 1 V . A r r a n g e t h e s e i n o r d e r o f d e c r e a s i n g e l e c t r o p o s i t i v e c h a r a c t e r a n d s u p p o r t y o u a n s w e r . A n s . H i g h e r t h e e l e c t r o d e p o t e n t i a l l o w e r i s i t s t e n d e n c y t o l o s e e l e c t r o n s a n d t h e r e f o r e , l o w e r i s t h e e l e c t r o p o s i t i v e c h a r a c t e r o f t h e m e t a l . S o t h e m e t a l s a r e a r r a n g e d a s : B , D , A , C . 1 0 . G i v e a n y t h r e e f a c t o r s f a v o u r a b l e f o r t h e f o r m a t i o n o f i o n i c b o n d . A n s . ( a ) L o w i o n i z a t i o n e n t h a l p y o f t h e m e t a l a t o m . ( b ) H i g h e l e c t r o n g a i n e n t h a l p y o f t h e n o n - m e t a l a t o m . ( c ) H i g h l a t t i c e e n t h a l p y o f t h e c o m p o u n d f o r m e d . 1 1 . i . W h i c h o f t h e t w o i s m o r e s t a b l e o r a n d w h y ? i i . A l l b o n d s i n P C l 5 a r e n o t e q u a l . E x p l a i n . i i i . W h i c h o f t h e t w o i s m o r e i o n i c - N a C l o r N a I a n d w h y ? A n s . ( i ) i s m o r e s t a b l e t h a n a s i t c o n t a i n s n o e l e c t r o n i n a n t i b o n d i n g M O w h i l e l a t t e r c o n t a i n s a n e l e c t r o n i n a n t i b o n d i n g M O m a k i n g i t l e s s s t a b l e . ( i i ) P C l 5 c o n t a i n s a x i a l a n d e q u a t o r i a l b o n d s . A x i a l b o n d s a r e l o n g e r t h a n e q u a t o r i a l b o n d s a s t h e y f a c e m o r e r e p u l s i o n f r o m e q u a t o r i a l b o n d s . H e n c e a x i a l b o n d s a r e w e a k e r t h a n e q u a t o r i a l b o n d s . ( i i i ) N a I i s m o r e c o v a l e n t d u e t o h i g h p o l a r i z a b i l i t y o f i o d i d e t h a n c h l o r i d e i o n . 1 2 . E x p l a i n t h e f o l l o w i n g t e r m s w i t h a n e x a m p l e e a c h : i ) O p e n s y s t e m i i ) I s o l a t e d s y s t e m i i i ) C l o s e d s y s t e m A n s . ( i ) I n a n o p e n s y s t e m , t h e r e i s e x c h a n g e o f e n e r g y a n d m a t t e r b e t w e e n s y s t e m a n d s u r r o u n d i n g s . T h e p r e s e n c e o f r e a c t a n t s i n a n o p e n b e a k e r i s a n e x a m p l e o f a n o p e n s y s t e m . H e r e t h e b o u n d a r y i s a n i m a g i n a r y s u r f a c e e n c l o s i n g t h e b e a k e r a n d r e a c t a n t s . ( i i ) I n a c l o s e d s y s t e m , t h e r e i s n o e x c h a n g e o f m a t t e r , b u t e x c h a n g e o f e n e r g y i s p o s s i b l e b e t w e e n s y s t e m a n d t h e s u r r o u n d i n g s . T h e p r e s e n c e o f r e a c t a n t s i n a c l o s e d v e s s e l m a d e o f c o n d u c t i n g m a t e r i a l e . g . c o p p e r o r s t e e l i s a n e x a m p l e o f a c l o s e d s y s t e m . ( i i i ) I n a n i s o l a t e d s y s t e m , t h e r e i s n o e x c h a n g e o f e n e r g y o r m a t t e r b e t w e e n t h e s y s t e m a n d t h e s u r r o u n d i n g s . T h e p r e s e n c e o f r e a c t a n t s i n a t h e r m o s f l a s k o r a n y o t h e r c l o s e d i n s u l a t e d v e s s e l i s a n e x a m p l e o f a n i s o l a t e d s y s t e m . 1 3 . D r a w t h e s t r u c t u r e o f t h e f o l l o w i n g I U P A C c o m p o u n d s : a ) 2 , 8 - D i m e t h y l - 3 , 6 - d e c a d i e n e b ) 4 - E t h y l - 2 , 6 - d i m e t h y l - d e c - 4 - e n e 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 . I f a m e t a l i s h i g h e r t h a n a p a r t i c u l a r m e t a l i n e l e c t r o c h e m i c a l s e r i e s , w i l l i t b e s t r o n g e r r e d u c i n g a g e n t o r w e a k e r r e d u c i n g a g e n t ? W h y ? A n s . I t w i l l b e a w e a k e r r e d u c i n g a g e n t i f e l e c t r o c h e m i c a l s e r i e s h a s e l e m e n t s i n d e c r e a s i n g o r d e r o f t h e i r r e d u c t i o n p o t e n t i a l . 2 . I f t h e c r i t i c a l t e m p e r a t u r e f o r c a r b o n d i o x i d e a n d m e t h a n e a r e 3 1 . 1 0 C a n d – 8 1 . 9 0 C r e s p e c t i v e l y , t h e n w h i c h o f t h e s e h a s s t r o n g i n t e r m o l e c u l a r f o r c e s ? G i v e r e a s o n . A n s . T h e i n t e r m o l e c u l a r f o r c e s i n c a r b o n d i o x i d e a r e m o r e t h a n i n m e t h a n e m o l e c u l e s b e c a u s e o f g r e a t e r p o l a r i t y . 3 . W h i c h o f t h e s e c o n t a i n t h e l a r g e s t n u m b e r o f a t o m s – 1 . 0 g L i ( s ) a n d 1 g N a ( s ) ? A n s . 1 . 0 g L i . 4 . P r e d i c t t h e s h a p e o f t h e P H 3 m o l e c u l e a c c o r d i n g t o V S E P R t h e o r y . A n s . T r i g o n a l p y r a m i d a l . 5 . G i v e r e a s o n : “ M e t a l l i c h y d r i d e s a r e u s e d f o r s t o r i n g h y d r o g e n ” . A n s . M e t a l l i c h y d r i d e s t r a p h y d r o g e n i n t h e i r v o i d s f o r m i n g i n t e r s t i t i a l h y d r i d e s , t h u s t h e y c a n b e u s e d f o r s t o r i n g h y d r o g e n . 6 . C o n v e r t : a ) C a r b o n t o b e n z e n e . b ) C a l c i u m c a r b i d e t o o x a l i c a c i d . A n s . 7 . H o w w o u l d y o u c a l c u l a t e t h e p H o f 0 . 0 0 1 M N a O H ? O r R a m e s h f o r g o t t o a d d t h e r e a c t i o n m i x t u r e t o t h e r o u n d b o t t o m e d f l a s k a t 2 7 o C b u t i n s t e a d h e p l a c e d t h e f l a s k o n t h e f l a m e . B u t a f t e r s o m e t i m e , h e r e a l i z e d h i s m i s t a k e a n d u s e d p y r o m e t e r a n d f o u n d t h e t e m p e r a t u r e o f t h e f l a s k w h i c h w a s 4 7 7 o C . W h a t f r a c t i o n o f a i r w o u l d h a v e b e e n e x p e l l e d o u t ? A n s . [ N a O H ] = [ ] = 0 . 0 0 1 M 8 . S t a t e t h e d i f f e r e n c e b e t w e e n c l a s s i c a l s m o g a n d p h o t o c h e m i c a l s m o g . A n s . C l a s s i c a l s m o g P h o t o c h e m i c a l s m o g O c c u r s i n c o o l h u m i d c l i m a t e . O c c u r s i n w a r m , d r y a n d s u n n y c l i m a t e . I t i s a m i x t u r e o f s m o k e , f o g a n d s u l p h u r d i o x i d e . C o m p o n e n t s o f p h o t o c h e m i c a l s m o g r e s u l t f r o m t h e a c t i o n o f s u n l i g h t o n u n s a t u r a t e d h y d r o c a r b o n s & o x i d e s o f n i t r o g e n p r o d u c e d b y a u t o m o b i l e s & f a c t o r i e s . 9 . G i v e n t h e e l e c t r o d e r e d u c t i o n p o t e n t i a l s o f f o u r m e t a l l i c e l e m e n t s A , B , C a n d D = + 0 . 7 9 , - 0 . 7 4 , 1 . 0 8 a n d – 0 . 3 1 V . A r r a n g e t h e s e i n o r d e r o f d e c r e a s i n g e l e c t r o p o s i t i v e c h a r a c t e r a n d s u p p o r t y o u a n s w e r . A n s . H i g h e r t h e e l e c t r o d e p o t e n t i a l l o w e r i s i t s t e n d e n c y t o l o s e e l e c t r o n s a n d t h e r e f o r e , l o w e r i s t h e e l e c t r o p o s i t i v e c h a r a c t e r o f t h e m e t a l . S o t h e m e t a l s a r e a r r a n g e d a s : B , D , A , C . 1 0 . G i v e a n y t h r e e f a c t o r s f a v o u r a b l e f o r t h e f o r m a t i o n o f i o n i c b o n d . A n s . ( a ) L o w i o n i z a t i o n e n t h a l p y o f t h e m e t a l a t o m . ( b ) H i g h e l e c t r o n g a i n e n t h a l p y o f t h e n o n - m e t a l a t o m . ( c ) H i g h l a t t i c e e n t h a l p y o f t h e c o m p o u n d f o r m e d . 1 1 . i . W h i c h o f t h e t w o i s m o r e s t a b l e o r a n d w h y ? i i . A l l b o n d s i n P C l 5 a r e n o t e q u a l . E x p l a i n . i i i . W h i c h o f t h e t w o i s m o r e i o n i c - N a C l o r N a I a n d w h y ? A n s . ( i ) i s m o r e s t a b l e t h a n a s i t c o n t a i n s n o e l e c t r o n i n a n t i b o n d i n g M O w h i l e l a t t e r c o n t a i n s a n e l e c t r o n i n a n t i b o n d i n g M O m a k i n g i t l e s s s t a b l e . ( i i ) P C l 5 c o n t a i n s a x i a l a n d e q u a t o r i a l b o n d s . A x i a l b o n d s a r e l o n g e r t h a n e q u a t o r i a l b o n d s a s t h e y f a c e m o r e r e p u l s i o n f r o m e q u a t o r i a l b o n d s . H e n c e a x i a l b o n d s a r e w e a k e r t h a n e q u a t o r i a l b o n d s . ( i i i ) N a I i s m o r e c o v a l e n t d u e t o h i g h p o l a r i z a b i l i t y o f i o d i d e t h a n c h l o r i d e i o n . 1 2 . E x p l a i n t h e f o l l o w i n g t e r m s w i t h a n e x a m p l e e a c h : i ) O p e n s y s t e m i i ) I s o l a t e d s y s t e m i i i ) C l o s e d s y s t e m A n s . ( i ) I n a n o p e n s y s t e m , t h e r e i s e x c h a n g e o f e n e r g y a n d m a t t e r b e t w e e n s y s t e m a n d s u r r o u n d i n g s . T h e p r e s e n c e o f r e a c t a n t s i n a n o p e n b e a k e r i s a n e x a m p l e o f a n o p e n s y s t e m . H e r e t h e b o u n d a r y i s a n i m a g i n a r y s u r f a c e e n c l o s i n g t h e b e a k e r a n d r e a c t a n t s . ( i i ) I n a c l o s e d s y s t e m , t h e r e i s n o e x c h a n g e o f m a t t e r , b u t e x c h a n g e o f e n e r g y i s p o s s i b l e b e t w e e n s y s t e m a n d t h e s u r r o u n d i n g s . T h e p r e s e n c e o f r e a c t a n t s i n a c l o s e d v e s s e l m a d e o f c o n d u c t i n g m a t e r i a l e . g . c o p p e r o r s t e e l i s a n e x a m p l e o f a c l o s e d s y s t e m . ( i i i ) I n a n i s o l a t e d s y s t e m , t h e r e i s n o e x c h a n g e o f e n e r g y o r m a t t e r b e t w e e n t h e s y s t e m a n d t h e s u r r o u n d i n g s . T h e p r e s e n c e o f r e a c t a n t s i n a t h e r m o s f l a s k o r a n y o t h e r c l o s e d i n s u l a t e d v e s s e l i s a n e x a m p l e o f a n i s o l a t e d s y s t e m . 1 3 . D r a w t h e s t r u c t u r e o f t h e f o l l o w i n g I U P A C c o m p o u n d s : a ) 2 , 8 - D i m e t h y l - 3 , 6 - d e c a d i e n e b ) 4 - E t h y l - 2 , 6 - d i m e t h y l - d e c - 4 - e n e c ) 1 , 3 , 5 , 7 O c t a t e t r a e n e d ) 4 - N i t r o s o - N - d i m e t h y l b e n z e n a m i n e e ) B e n z e n e 1 , 4 - d i c a r b o x y l i c a c i d f ) 1 - P h e n y l p r o p a n o n e A n s . 1 4 . i ) C a l c u l a t e t h e p e r c e n t a g e o f C a n d H i n 0 . 2 4 7 5 g o f a n o r g a n i c c o m p o u n d g a v e o n c o m b u s t i o n 0 . 4 9 5 0 g o f c a r b o n d i o x i d e a n d 0 . 2 0 2 5 g o f w a t e r . i i ) W h a t w i l l h a p p e n d u r i n g L a s s a i g n e ' s t e s t f o r n i t r o g e n i f t h e c o m p o u n d a l s o c o n t a i n s s u l p h u r ? A n s . ( i ) M a s s o f o r g a n i c c o m p o u n d = 0 . 2 4 7 5 g M a s s o f c a r b o n d i o x i d e p r o d u c e d = 0 . 4 9 5 0 gRead More
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FAQs on Past Year Paper with solution: Chemistry, 2017, Class 11 - Chemistry for Grade 11
| 1. What are the properties of acids and bases? |  |
Ans. Acids are substances that donate hydrogen ions (H+) in a solution, while bases are substances that accept hydrogen ions or donate hydroxide ions (OH-) in a solution. Some common properties of acids include sour taste, ability to react with metals to produce hydrogen gas, and ability to change the color of indicators. Bases, on the other hand, have a bitter taste, feel slippery, and can turn red litmus paper blue.
| 2. How can we calculate the molar mass of a compound? | |
Ans. To calculate the molar mass of a compound, we add up the atomic masses of all the atoms present in the compound. The atomic mass of an element can be found on the periodic table. We multiply the atomic mass of each element by the number of atoms of that element in the compound and then sum up these values to obtain the molar mass.
| 3. What is the difference between an exothermic and endothermic reaction? | |
Ans. An exothermic reaction is a reaction that releases heat energy to its surroundings, resulting in an increase in temperature. In contrast, an endothermic reaction is a reaction that absorbs heat energy from its surroundings, causing a decrease in temperature. Exothermic reactions often feel warm or hot, while endothermic reactions feel cold.
| 4. How can we determine the number of moles of a substance? | |
Ans. The number of moles of a substance can be determined by dividing its mass by its molar mass. The mass of a substance can be measured using a balance, while the molar mass can be calculated by summing up the atomic masses of all the atoms in the substance. The unit for the number of moles is mol.
| 5. What is the difference between a physical change and a chemical change? | |
Ans. A physical change is a change in the physical properties of a substance, such as its shape, size, or state, without the formation of a new substance. Examples of physical changes include melting, boiling, and dissolving. On the other hand, a chemical change involves the formation of new substances with different properties. It often involves the breaking and forming of chemical bonds. Examples of chemical changes include burning, rusting, and digestion.
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Past Year Paper with solution: Chemistry, 2017, Class 11 Notes
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The content of Past Year Paper with solution: Chemistry, 2017, Class 11 is prepared as per the latest Grade 11 syllabus.
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