Courses

# Jee 2004 chemistry Solutions, Class 12, Chemistry JEE Notes | EduRev

## JEE : Jee 2004 chemistry Solutions, Class 12, Chemistry JEE Notes | EduRev

``` Page 1

FIITJEE Ltd. ICES House, Sarvapriya Vihar (Near Hauz Khas Bus  Term.), New Delhi - 16, Ph : 2686 5182, 26965626,  2685 4102, 26515949 Fax : 26513942
F FI II IT TJ JE EE E  S So ol lu ut ti io on ns s  t to o  I II IT TJ JE EE E– –2 20 00 04 4  M Ma ai in ns s  P Pa ap pe er r
C
C
h
h
e
e
m
m
i
i
s
s
t
t
r
r
y
y

Time: 2 hours

Note: Question number 1 to 10 carries 2 marks each and 11 to 20 carries 4 marks each.

1. For the given reaction
A + B ?? ? Products
Following data were given
Initial conc. (m/L). Initial conc. (m/L) Initial rate [mL
-1
s
-1
]
[A]    [B]
0.1    0.1   0.05
0.2    0.1   0.1
0.1     0.2   0.05
a) Write the rate equation.
b) Calculate the rate constant.

Sol. a) Let the order w.r.t A & B are x any y respectively
r = K[A]
x
[B]
y

0.05 = K[0.1]
x
[0.1]
y

0.1 = K[0.2]
x
[0.1]
y

or 2 = 
x

x =1
0.05 = K[0.1]
x
[0.1]
y

0.05 = K[0.1]
x
[0.2]
y

1 = 
y

y=0
b) rate equation = r = K[A] [B]
0

0.1 = K[0.2]
K = 0.5 Sec
-1

2. 100 ml of a liquid contained in an isolated container at a pressure of 1 bar. The pressure is steeply increased
to 100 bar. The volume of the liquid is decreased by 1 ml at this constant pressure. Find the ?H & ?U.

Sol. ?H =0,  ?q
p
= ?U-W
W = PdV
= 100 ×1 atmmL
= 10
-2
KJ = ?U

3. Draw the shape of XeF
4
and OSF
4
according to VSEPR theory. Show the lone pair of electrons on the
central atom

Sol.
F
FF
F
Xe
(square planar)
(sp
3
d
2
)
F
O
F
S
F
F
(Trigonal bipyramidal)
(sp
3
d)

Page 2

FIITJEE Ltd. ICES House, Sarvapriya Vihar (Near Hauz Khas Bus  Term.), New Delhi - 16, Ph : 2686 5182, 26965626,  2685 4102, 26515949 Fax : 26513942
F FI II IT TJ JE EE E  S So ol lu ut ti io on ns s  t to o  I II IT TJ JE EE E– –2 20 00 04 4  M Ma ai in ns s  P Pa ap pe er r
C
C
h
h
e
e
m
m
i
i
s
s
t
t
r
r
y
y

Time: 2 hours

Note: Question number 1 to 10 carries 2 marks each and 11 to 20 carries 4 marks each.

1. For the given reaction
A + B ?? ? Products
Following data were given
Initial conc. (m/L). Initial conc. (m/L) Initial rate [mL
-1
s
-1
]
[A]    [B]
0.1    0.1   0.05
0.2    0.1   0.1
0.1     0.2   0.05
a) Write the rate equation.
b) Calculate the rate constant.

Sol. a) Let the order w.r.t A & B are x any y respectively
r = K[A]
x
[B]
y

0.05 = K[0.1]
x
[0.1]
y

0.1 = K[0.2]
x
[0.1]
y

or 2 = 
x

x =1
0.05 = K[0.1]
x
[0.1]
y

0.05 = K[0.1]
x
[0.2]
y

1 = 
y

y=0
b) rate equation = r = K[A] [B]
0

0.1 = K[0.2]
K = 0.5 Sec
-1

2. 100 ml of a liquid contained in an isolated container at a pressure of 1 bar. The pressure is steeply increased
to 100 bar. The volume of the liquid is decreased by 1 ml at this constant pressure. Find the ?H & ?U.

Sol. ?H =0,  ?q
p
= ?U-W
W = PdV
= 100 ×1 atmmL
= 10
-2
KJ = ?U

3. Draw the shape of XeF
4
and OSF
4
according to VSEPR theory. Show the lone pair of electrons on the
central atom

Sol.
F
FF
F
Xe
(square planar)
(sp
3
d
2
)
F
O
F
S
F
F
(Trigonal bipyramidal)
(sp
3
d)

FIITJEE Ltd. ICES House, Sarvapriya Vihar (Near Hauz Khas Bus  Term.), New Delhi - 16, Ph : 2686 5182, 26965626,  2685 4102, 26515949 Fax : 26513942
IIT-JEE 2004-M-2
4. The structure of D-Glucose is as follows

CHO
HOH
H O H
HOH
OH H
O H

a) Draw the structure of L – Glucose.
b) Give the reaction of L – Glucose with Tollens reagent.

Sol.
CHO
HOH
H O H
HOH
H O H
O H
(L glu cos e) -
HOH
H O H
HOH
H O H
O H
O
-
O
32
Ag(NH )
+
? ??? ?

5. a) Draw New mann`s projection for the less stable staggered form of butane.
b) Relatively less stability of the staggered form is due to
i) Torsional strain.
ii) Vander Waal’s strain.
iii) Combination of the above two.
Sol.  a)
CH
3
H
H
.
H
.
CH
3
.
H

b) Less stability is due to Vander Waal’s strain

6. Arrange the following oxides in the increasing order of Bronsted basicity.

27 3 2 2 3
Cl O,BaO,SO ,CO,B O
Sol.
27 3 2 2 3
ClOSO CO BOBaO << < <

7. AlF
3
is insoluble in anhydrous HF but when little KF is added to the compound it becomes soluble. On
3
,AlF
3
is precipitated. Write the balanced chemical equations.

Sol. 3KF + AlF
3
??? K
3
AlF
6

K
3
AlF
6
+ 3BF
3
?? ? AlF
3
+ 3KBF
4

8. The crystal AB (rock salt structure) has molecular weight 6.023 y amu.  where y is  an arbitrary number in
amu.. If the minimum distance between cation & anion is
1/3
ynm and the observed density is
3
20Kg / m .
Find the
a) density in
3
Kg / m and
b) type of defect
Page 3

FIITJEE Ltd. ICES House, Sarvapriya Vihar (Near Hauz Khas Bus  Term.), New Delhi - 16, Ph : 2686 5182, 26965626,  2685 4102, 26515949 Fax : 26513942
F FI II IT TJ JE EE E  S So ol lu ut ti io on ns s  t to o  I II IT TJ JE EE E– –2 20 00 04 4  M Ma ai in ns s  P Pa ap pe er r
C
C
h
h
e
e
m
m
i
i
s
s
t
t
r
r
y
y

Time: 2 hours

Note: Question number 1 to 10 carries 2 marks each and 11 to 20 carries 4 marks each.

1. For the given reaction
A + B ?? ? Products
Following data were given
Initial conc. (m/L). Initial conc. (m/L) Initial rate [mL
-1
s
-1
]
[A]    [B]
0.1    0.1   0.05
0.2    0.1   0.1
0.1     0.2   0.05
a) Write the rate equation.
b) Calculate the rate constant.

Sol. a) Let the order w.r.t A & B are x any y respectively
r = K[A]
x
[B]
y

0.05 = K[0.1]
x
[0.1]
y

0.1 = K[0.2]
x
[0.1]
y

or 2 = 
x

x =1
0.05 = K[0.1]
x
[0.1]
y

0.05 = K[0.1]
x
[0.2]
y

1 = 
y

y=0
b) rate equation = r = K[A] [B]
0

0.1 = K[0.2]
K = 0.5 Sec
-1

2. 100 ml of a liquid contained in an isolated container at a pressure of 1 bar. The pressure is steeply increased
to 100 bar. The volume of the liquid is decreased by 1 ml at this constant pressure. Find the ?H & ?U.

Sol. ?H =0,  ?q
p
= ?U-W
W = PdV
= 100 ×1 atmmL
= 10
-2
KJ = ?U

3. Draw the shape of XeF
4
and OSF
4
according to VSEPR theory. Show the lone pair of electrons on the
central atom

Sol.
F
FF
F
Xe
(square planar)
(sp
3
d
2
)
F
O
F
S
F
F
(Trigonal bipyramidal)
(sp
3
d)

FIITJEE Ltd. ICES House, Sarvapriya Vihar (Near Hauz Khas Bus  Term.), New Delhi - 16, Ph : 2686 5182, 26965626,  2685 4102, 26515949 Fax : 26513942
IIT-JEE 2004-M-2
4. The structure of D-Glucose is as follows

CHO
HOH
H O H
HOH
OH H
O H

a) Draw the structure of L – Glucose.
b) Give the reaction of L – Glucose with Tollens reagent.

Sol.
CHO
HOH
H O H
HOH
H O H
O H
(L glu cos e) -
HOH
H O H
HOH
H O H
O H
O
-
O
32
Ag(NH )
+
? ??? ?

5. a) Draw New mann`s projection for the less stable staggered form of butane.
b) Relatively less stability of the staggered form is due to
i) Torsional strain.
ii) Vander Waal’s strain.
iii) Combination of the above two.
Sol.  a)
CH
3
H
H
.
H
.
CH
3
.
H

b) Less stability is due to Vander Waal’s strain

6. Arrange the following oxides in the increasing order of Bronsted basicity.

27 3 2 2 3
Cl O,BaO,SO ,CO,B O
Sol.
27 3 2 2 3
ClOSO CO BOBaO << < <

7. AlF
3
is insoluble in anhydrous HF but when little KF is added to the compound it becomes soluble. On
3
,AlF
3
is precipitated. Write the balanced chemical equations.

Sol. 3KF + AlF
3
??? K
3
AlF
6

K
3
AlF
6
+ 3BF
3
?? ? AlF
3
+ 3KBF
4

8. The crystal AB (rock salt structure) has molecular weight 6.023 y amu.  where y is  an arbitrary number in
amu.. If the minimum distance between cation & anion is
1/3
ynm and the observed density is
3
20Kg / m .
Find the
a) density in
3
Kg / m and
b) type of defect

FIITJEE Ltd. ICES House, Sarvapriya Vihar (Near Hauz Khas Bus  Term.), New Delhi - 16, Ph : 2686 5182, 26965626,  2685 4102, 26515949 Fax : 26513942
IIT-JEE 2004-M-3
Sol. a) Density
23 27
46.023 y
6.023 10 8 y 10
-
××
=
××××
[Since a = 2y
1/3
]

33
510g/m =×

3
5Kg / m =
b) Since the (density) calculated < density observed, it means the defect is metal excess defect.

9. Which of the following is more acidic and why?

NH
3
+
NH
3
+
F
,

Sol.
NH
3
+
F

is more acidic due to – inductive effect of fluorine

10. 7-bromo-1,3,5-cycloheptatriene exists as ionic species in aqueous solution while 5-bromo-1,3
cyclopentadiene doesn’t ionise even in presence of Ag (aq),
+
Explain.

Sol.
Aromatic Ion
(highly stable)
Ag aq.
?
?? ? ?
Br
Br
Ag
?
?? ? ?
Antiaromatic Ion
(highly unstable)

11. a) The schrodinger wave equation for hydrogen atoms is
?
2s
=
3/2
r/a
1/ 2
00
11 r
2e
aa 4(2 )
-
?? ? ?
-
?? ? ?
p
?? ? ?

Where a
0
is Bohr’s radius. Let the radial node in 2s be at r
0
. Then find r in terms of a
0
.
b) A base ball having mass 100 g moves with velocity 100 m/sec. Find out the value of wave length of
base ball.
c)
7 234
92
6
XY.
-a
-ß
?? ? ? Find out atomic number, mass number of Y and identify it.

Sol. a)
2
2s
? = probability of finding electrons at any place
??
2
= 0 at node
```
Offer running on EduRev: Apply code STAYHOME200 to get INR 200 off on our premium plan EduRev Infinity!

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

;