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Page 1
MS CLASS XII CHEMISTRY 2019-20
Q.No. Value points Marks
SECTION:A
1. Reaction taking place at cathode when the battery is in use:
) ( 2 ) ( 2 ) ( 4 ) ( ) (
2 4
2
4 2
l O H s PbSO e aq H aq SO s PbO ? ? ? ? ?
? ? ?
1
2. 2 F
1
3.
M Molarity 02 . 5
100 98
1000 294 . 1 38
?
?
? ?
?
1
4. It can be recharged after use.
1
5. At anode: O
2
(g)
At cathode: H
2
(g)
½
½
6. Sodium cyanide. 1
7. Nucleotide
1
8. Zwitterion / dipolar ion 1
9. Condensation 1
10. Benzaldehyde 1
11. (c) 1
12. (b) 1
13. (b) 1
14. (a) 1
15. (b) 1
16. (c) 1
17. (a) 1
18. (d) 1
19. (d) 1
20. (d) 1
SECTION:B
21. Lone pairs : 2
Geometry : Square planar
1
1
22.
(i)
(ii)
R
E
Slope
a
303 . 2
? ?
k
1
> k
2
1
1
23. When there is dissociation of solute into ions, in dilute solutions (ignoring
interionic attractions) the number of particles increases. As the value of
colligative properties depends on the number of particles of the solute , the
experimentally observed value of colligative property will be higher than
the true value, therefore the experimentally determined (observed) molar
mass is always lower than the true value.
For KCl(electrolyte) the experimentally determined molar mass is always
1
½
Page 2
MS CLASS XII CHEMISTRY 2019-20
Q.No. Value points Marks
SECTION:A
1. Reaction taking place at cathode when the battery is in use:
) ( 2 ) ( 2 ) ( 4 ) ( ) (
2 4
2
4 2
l O H s PbSO e aq H aq SO s PbO ? ? ? ? ?
? ? ?
1
2. 2 F
1
3.
M Molarity 02 . 5
100 98
1000 294 . 1 38
?
?
? ?
?
1
4. It can be recharged after use.
1
5. At anode: O
2
(g)
At cathode: H
2
(g)
½
½
6. Sodium cyanide. 1
7. Nucleotide
1
8. Zwitterion / dipolar ion 1
9. Condensation 1
10. Benzaldehyde 1
11. (c) 1
12. (b) 1
13. (b) 1
14. (a) 1
15. (b) 1
16. (c) 1
17. (a) 1
18. (d) 1
19. (d) 1
20. (d) 1
SECTION:B
21. Lone pairs : 2
Geometry : Square planar
1
1
22.
(i)
(ii)
R
E
Slope
a
303 . 2
? ?
k
1
> k
2
1
1
23. When there is dissociation of solute into ions, in dilute solutions (ignoring
interionic attractions) the number of particles increases. As the value of
colligative properties depends on the number of particles of the solute , the
experimentally observed value of colligative property will be higher than
the true value, therefore the experimentally determined (observed) molar
mass is always lower than the true value.
For KCl(electrolyte) the experimentally determined molar mass is always
1
½
lower than the true value when water is used as solvent.
Glucose (non-electrolyte) does not show a large variation from the true
value.
½
24.
(a)
(b)
CH3-CH(Cl)-COOH
C6H5CHO
1
1
25.
IUPAC Name of the entity:
Dichloridobis(ethane-1,2-diamine)platinum(IV) ion
OR
Bonding in
? 3
6 3
] ) ( [ NH CO
d
2
sp
3
hybridisation
Geometry: Octahedral
Diamagnetic
1
1
½
½
½
½
26. Vapour phase refining: It is a refining method in which the metal is
converted into its volatile compound and collected elsewhere. It is then
decomposed to give pure metal.
Example:Mond’s Process for refining of Nickel / van Arkel method for
refining of Zirconium
1
1
Page 3
MS CLASS XII CHEMISTRY 2019-20
Q.No. Value points Marks
SECTION:A
1. Reaction taking place at cathode when the battery is in use:
) ( 2 ) ( 2 ) ( 4 ) ( ) (
2 4
2
4 2
l O H s PbSO e aq H aq SO s PbO ? ? ? ? ?
? ? ?
1
2. 2 F
1
3.
M Molarity 02 . 5
100 98
1000 294 . 1 38
?
?
? ?
?
1
4. It can be recharged after use.
1
5. At anode: O
2
(g)
At cathode: H
2
(g)
½
½
6. Sodium cyanide. 1
7. Nucleotide
1
8. Zwitterion / dipolar ion 1
9. Condensation 1
10. Benzaldehyde 1
11. (c) 1
12. (b) 1
13. (b) 1
14. (a) 1
15. (b) 1
16. (c) 1
17. (a) 1
18. (d) 1
19. (d) 1
20. (d) 1
SECTION:B
21. Lone pairs : 2
Geometry : Square planar
1
1
22.
(i)
(ii)
R
E
Slope
a
303 . 2
? ?
k
1
> k
2
1
1
23. When there is dissociation of solute into ions, in dilute solutions (ignoring
interionic attractions) the number of particles increases. As the value of
colligative properties depends on the number of particles of the solute , the
experimentally observed value of colligative property will be higher than
the true value, therefore the experimentally determined (observed) molar
mass is always lower than the true value.
For KCl(electrolyte) the experimentally determined molar mass is always
1
½
lower than the true value when water is used as solvent.
Glucose (non-electrolyte) does not show a large variation from the true
value.
½
24.
(a)
(b)
CH3-CH(Cl)-COOH
C6H5CHO
1
1
25.
IUPAC Name of the entity:
Dichloridobis(ethane-1,2-diamine)platinum(IV) ion
OR
Bonding in
? 3
6 3
] ) ( [ NH CO
d
2
sp
3
hybridisation
Geometry: Octahedral
Diamagnetic
1
1
½
½
½
½
26. Vapour phase refining: It is a refining method in which the metal is
converted into its volatile compound and collected elsewhere. It is then
decomposed to give pure metal.
Example:Mond’s Process for refining of Nickel / van Arkel method for
refining of Zirconium
1
1
Equations involved:
4
350 330
) ( 4 CO Ni CO Ni
K
? ? ? ? ? ?
?
CO Ni CO Ni
K
4 ) (
470 450
4
? ? ? ? ? ?
?
OR
Extraction of gold involves leaching the metal with CN
-
Oxidation reaction:
4 Au (s) + 8 CN- (aq.) + 2H
2
O (aq.) + O
2
(g) ?4[Au(CN)
2
]
-
(aq.) + 4 OH
-
(aq.)
The metal is recovered by displacement method:
2[Au(CN)
2
]- (aq.) + Zn (s) ? 2 Au (s) + [Zn(CN)
4
]
2-
(aq.)
Zinc acts as a reducing agent.
½
½
½
½
½
½
27. The following compound will undergo S
N
1 faster:
CH
2
Cl
Greater the stability of the carbocation, greater will be its ease of formation
from the corresponding halide and faster will be the rate of reaction.
The benzylic carbocation formed gets stabilised through resonance.
CH
3
CH
2
CH
2
Cl forms a 1
0
carbocation, which is less stable than benzylic
carbocation.
½
½
½
½
SECTION :C
28. KCl ? K
+
+ Cl
-
n =2
?
? ?
? ?
? ? ?
1
1
i
n i
½
½
½
Page 4
MS CLASS XII CHEMISTRY 2019-20
Q.No. Value points Marks
SECTION:A
1. Reaction taking place at cathode when the battery is in use:
) ( 2 ) ( 2 ) ( 4 ) ( ) (
2 4
2
4 2
l O H s PbSO e aq H aq SO s PbO ? ? ? ? ?
? ? ?
1
2. 2 F
1
3.
M Molarity 02 . 5
100 98
1000 294 . 1 38
?
?
? ?
?
1
4. It can be recharged after use.
1
5. At anode: O
2
(g)
At cathode: H
2
(g)
½
½
6. Sodium cyanide. 1
7. Nucleotide
1
8. Zwitterion / dipolar ion 1
9. Condensation 1
10. Benzaldehyde 1
11. (c) 1
12. (b) 1
13. (b) 1
14. (a) 1
15. (b) 1
16. (c) 1
17. (a) 1
18. (d) 1
19. (d) 1
20. (d) 1
SECTION:B
21. Lone pairs : 2
Geometry : Square planar
1
1
22.
(i)
(ii)
R
E
Slope
a
303 . 2
? ?
k
1
> k
2
1
1
23. When there is dissociation of solute into ions, in dilute solutions (ignoring
interionic attractions) the number of particles increases. As the value of
colligative properties depends on the number of particles of the solute , the
experimentally observed value of colligative property will be higher than
the true value, therefore the experimentally determined (observed) molar
mass is always lower than the true value.
For KCl(electrolyte) the experimentally determined molar mass is always
1
½
lower than the true value when water is used as solvent.
Glucose (non-electrolyte) does not show a large variation from the true
value.
½
24.
(a)
(b)
CH3-CH(Cl)-COOH
C6H5CHO
1
1
25.
IUPAC Name of the entity:
Dichloridobis(ethane-1,2-diamine)platinum(IV) ion
OR
Bonding in
? 3
6 3
] ) ( [ NH CO
d
2
sp
3
hybridisation
Geometry: Octahedral
Diamagnetic
1
1
½
½
½
½
26. Vapour phase refining: It is a refining method in which the metal is
converted into its volatile compound and collected elsewhere. It is then
decomposed to give pure metal.
Example:Mond’s Process for refining of Nickel / van Arkel method for
refining of Zirconium
1
1
Equations involved:
4
350 330
) ( 4 CO Ni CO Ni
K
? ? ? ? ? ?
?
CO Ni CO Ni
K
4 ) (
470 450
4
? ? ? ? ? ?
?
OR
Extraction of gold involves leaching the metal with CN
-
Oxidation reaction:
4 Au (s) + 8 CN- (aq.) + 2H
2
O (aq.) + O
2
(g) ?4[Au(CN)
2
]
-
(aq.) + 4 OH
-
(aq.)
The metal is recovered by displacement method:
2[Au(CN)
2
]- (aq.) + Zn (s) ? 2 Au (s) + [Zn(CN)
4
]
2-
(aq.)
Zinc acts as a reducing agent.
½
½
½
½
½
½
27. The following compound will undergo S
N
1 faster:
CH
2
Cl
Greater the stability of the carbocation, greater will be its ease of formation
from the corresponding halide and faster will be the rate of reaction.
The benzylic carbocation formed gets stabilised through resonance.
CH
3
CH
2
CH
2
Cl forms a 1
0
carbocation, which is less stable than benzylic
carbocation.
½
½
½
½
SECTION :C
28. KCl ? K
+
+ Cl
-
n =2
?
? ?
? ?
? ? ?
1
1
i
n i
½
½
½
C T
T T T
T
m iK T
f
f f f
f
f f
0 '
' 0
24 . 0
24 . 0
100 5 . 74
1000 5 . 0
86 . 1 ) 92 . 0 1 (
? ?
? ? ?
? ?
? ?
? ?
x
x
x x
½
½
½
29.
) .......( ] 1 . 0 [ ] 2 . 0 [ 10 . 0
) ......( ] 1 . 0 [ ] 1 . 0 [ 05 . 0
] [ ] [
ii k
i k
B A k rate
y x
y x
y x
?
?
?
1
) 2 (
05 . 0
10 . 0
) ( ) (
) ......( ] 2 . 0 [ ] 1 . 0 [ 05 . 0
?
?
?
?
x
i ii
iii k
x
y x
0
) 2 (
05 . 0
05 . 0
) ( ) (
?
?
?
y
i iii
y
0 1
] [ ] [ B A k rate ?
It is a first order reaction.
s t
k
t
s o
A
rate
k
386 . 1
5 . 0
693 . 0 693 . 0
5 .
] [
2
1
2
1
1
?
? ?
? ?
?
OR
2
300
50
693 . 0
350
25
693 . 0
693 . 0
1
2
1
2
2
1
?
?
?
?
k
k
K k
K k
k
t
½
½
½
½
½
½
½
½
Page 5
MS CLASS XII CHEMISTRY 2019-20
Q.No. Value points Marks
SECTION:A
1. Reaction taking place at cathode when the battery is in use:
) ( 2 ) ( 2 ) ( 4 ) ( ) (
2 4
2
4 2
l O H s PbSO e aq H aq SO s PbO ? ? ? ? ?
? ? ?
1
2. 2 F
1
3.
M Molarity 02 . 5
100 98
1000 294 . 1 38
?
?
? ?
?
1
4. It can be recharged after use.
1
5. At anode: O
2
(g)
At cathode: H
2
(g)
½
½
6. Sodium cyanide. 1
7. Nucleotide
1
8. Zwitterion / dipolar ion 1
9. Condensation 1
10. Benzaldehyde 1
11. (c) 1
12. (b) 1
13. (b) 1
14. (a) 1
15. (b) 1
16. (c) 1
17. (a) 1
18. (d) 1
19. (d) 1
20. (d) 1
SECTION:B
21. Lone pairs : 2
Geometry : Square planar
1
1
22.
(i)
(ii)
R
E
Slope
a
303 . 2
? ?
k
1
> k
2
1
1
23. When there is dissociation of solute into ions, in dilute solutions (ignoring
interionic attractions) the number of particles increases. As the value of
colligative properties depends on the number of particles of the solute , the
experimentally observed value of colligative property will be higher than
the true value, therefore the experimentally determined (observed) molar
mass is always lower than the true value.
For KCl(electrolyte) the experimentally determined molar mass is always
1
½
lower than the true value when water is used as solvent.
Glucose (non-electrolyte) does not show a large variation from the true
value.
½
24.
(a)
(b)
CH3-CH(Cl)-COOH
C6H5CHO
1
1
25.
IUPAC Name of the entity:
Dichloridobis(ethane-1,2-diamine)platinum(IV) ion
OR
Bonding in
? 3
6 3
] ) ( [ NH CO
d
2
sp
3
hybridisation
Geometry: Octahedral
Diamagnetic
1
1
½
½
½
½
26. Vapour phase refining: It is a refining method in which the metal is
converted into its volatile compound and collected elsewhere. It is then
decomposed to give pure metal.
Example:Mond’s Process for refining of Nickel / van Arkel method for
refining of Zirconium
1
1
Equations involved:
4
350 330
) ( 4 CO Ni CO Ni
K
? ? ? ? ? ?
?
CO Ni CO Ni
K
4 ) (
470 450
4
? ? ? ? ? ?
?
OR
Extraction of gold involves leaching the metal with CN
-
Oxidation reaction:
4 Au (s) + 8 CN- (aq.) + 2H
2
O (aq.) + O
2
(g) ?4[Au(CN)
2
]
-
(aq.) + 4 OH
-
(aq.)
The metal is recovered by displacement method:
2[Au(CN)
2
]- (aq.) + Zn (s) ? 2 Au (s) + [Zn(CN)
4
]
2-
(aq.)
Zinc acts as a reducing agent.
½
½
½
½
½
½
27. The following compound will undergo S
N
1 faster:
CH
2
Cl
Greater the stability of the carbocation, greater will be its ease of formation
from the corresponding halide and faster will be the rate of reaction.
The benzylic carbocation formed gets stabilised through resonance.
CH
3
CH
2
CH
2
Cl forms a 1
0
carbocation, which is less stable than benzylic
carbocation.
½
½
½
½
SECTION :C
28. KCl ? K
+
+ Cl
-
n =2
?
? ?
? ?
? ? ?
1
1
i
n i
½
½
½
C T
T T T
T
m iK T
f
f f f
f
f f
0 '
' 0
24 . 0
24 . 0
100 5 . 74
1000 5 . 0
86 . 1 ) 92 . 0 1 (
? ?
? ? ?
? ?
? ?
? ?
x
x
x x
½
½
½
29.
) .......( ] 1 . 0 [ ] 2 . 0 [ 10 . 0
) ......( ] 1 . 0 [ ] 1 . 0 [ 05 . 0
] [ ] [
ii k
i k
B A k rate
y x
y x
y x
?
?
?
1
) 2 (
05 . 0
10 . 0
) ( ) (
) ......( ] 2 . 0 [ ] 1 . 0 [ 05 . 0
?
?
?
?
x
i ii
iii k
x
y x
0
) 2 (
05 . 0
05 . 0
) ( ) (
?
?
?
y
i iii
y
0 1
] [ ] [ B A k rate ?
It is a first order reaction.
s t
k
t
s o
A
rate
k
386 . 1
5 . 0
693 . 0 693 . 0
5 .
] [
2
1
2
1
1
?
? ?
? ?
?
OR
2
300
50
693 . 0
350
25
693 . 0
693 . 0
1
2
1
2
2
1
?
?
?
?
k
k
K k
K k
k
t
½
½
½
½
½
½
½
½
?
?
?
?
?
? ?
?
?
?
?
?
?
?
? ?
300 350
300 350
314 . 8 303 . 2
2 log
1 1
303 . 2
log
2 1 1
2
x x
a
a
E
T T R
E
k
k
Ea = 12.104 kJ / mol.
½
½
(1/2
+1/2)
30.
(a)
(b)
(c)
K
4
[Fe(CN)
6
]
Fe(OH)
3
is converted into colloidal state by preferential adsorption of Fe
3+
ions.
Proteins
1
1
1
31.
(a)
(b)
(c)
Moist sulphur dioxide behaves as a reducing agent, reduces MnO
4
-
to Mn
2+
.
X –X’ bond in interhalogens is weaker than X-X bond in halogensexcept F-
F bond.
Due to the ease with which it liberates atoms of nascent oxygen.
1
1
1
32. 1-Propoxypropane is formed.
Mechanism involved:
Step 1 :Formation of protonated alcohol
1
½
1
½
33.
(a)
(i)
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FAQs on Chemistry: CBSE Marking Scheme with Solution (2019-20) - Sample Papers for Class 12 Medical and Non-Medical
| 1. What is the CBSE marking scheme for Chemistry? |  |
Ans. The CBSE marking scheme for Chemistry includes the distribution of marks for different sections of the paper, such as theory, practicals, and projects. It also provides guidelines on how the answers should be evaluated and awarded marks based on the level of understanding and presentation.
| 2. How can I access the CBSE marking scheme for Chemistry for the year 2019-20? | |
Ans. The CBSE marking scheme for Chemistry for the year 2019-20 can be accessed through the official website of the Central Board of Secondary Education (CBSE). The marking scheme is usually available for download in the "Examinations" or "Academics" section of the website.
| 3. What does the CBSE marking scheme with solution include? | |
Ans. The CBSE marking scheme with solution includes the step-by-step solutions to the questions asked in the Chemistry exam. It provides a detailed explanation of the concepts used, along with the correct answers. The marking scheme helps students understand the approach and methodology to solve different types of questions.
| 4. How can the CBSE marking scheme with solution help in exam preparation? | |
Ans. The CBSE marking scheme with solution is a valuable resource for exam preparation as it provides a clear understanding of the expected answers and the marking scheme used by the examiners. By going through the solutions, students can identify the key points and presentation style required to score well in the Chemistry exam.
| 5. Is the CBSE marking scheme the same for all subjects? | |
Ans. No, the CBSE marking scheme is not the same for all subjects. Each subject has its own specific marking scheme, which takes into account the nature of the subject, the type of questions asked, and the assessment criteria. Therefore, the marking scheme for Chemistry may differ from the marking scheme of other subjects in the CBSE board exam.
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