CBSE Board Paper 2022 (Marking Scheme and Solutions) | Chemistry Class 12 - NEET PDF Download

 Page 1


XII_39_043_56/1/1_Chemistry # Page-1 
 
  Strictly Confidential: (For Internal and Restricted use only) 
Senior Secondary School Term –II Examination, 2022 
Marking Scheme: CHEMISTRY (Subject Code: 043) 
[ Paper Code: 56/1/1] 
General Instructions: - 
 
1. You are aware that evaluation is the most important process in the actual and correct 
assessment of the candidates. A small mistake in evaluation may lead to serious 
problems which may affect the future of the candidates, education system and teaching 
profession. To avoid mistakes, it is requested that before starting evaluation, you must 
read and understand the spot evaluation guidelines carefully. 
2.  “Evaluation policy is a confidential policy as it is related to the confidentiality of 
the examinations conducted, Evaluation done and several other aspects. Its ’ 
leakage to public in any manner could lead to derailment of the examination system 
and affect the life and future of millions of candidates. Sharing this 
policy/document to anyone, publishing in any magazine and printing in News 
Paper/Website etc may invite action under IPC. ” 
3. Evaluation is to be done as per instructions provided in the Marking Scheme. It should not 
be done according to one’s own interpretation or any other consideration. Marking 
Scheme should be strictly adhered to and religiously followed. However, while 
evaluating, answers which are based on latest information or knowledge and/or are 
innovative, they may be assessed for their correctness otherwise and marks be 
awarded to them. In class-X, while evaluating two competency-based questions, 
please try to understand given answer and even if reply is not from marking 
scheme but correct competency is enumerated by the candidate, marks should be 
awarded.   
4. The Head-Examiner must go through the first five answer books evaluated by each 
evaluator on the first day, to ensure that evaluation has been carried out as per the 
instructions given in the Marking Scheme. The remaining answer books meant for 
evaluation shall be given only after ensuring that there is no significant variation in the 
marking of individual evaluators. 
5. Evaluators will mark( v ) wherever answer is correct.  For wrong answer ‘X” be marked.  
Evaluators will not put right kind of mark while evaluating which gives an impression that 
answer is correct and no marks are awarded.  This is most common mistake which 
evaluators are committing. 
6. If a question has parts, please award marks on the right-hand side for each part. Marks 
awarded for different parts of the question should then be totalled up and written in the 
left-hand margin and encircled.  This may be followed strictly. 
7. If a question does not have any parts, marks must be awarded in the left-hand margin and 
encircled. This may also be followed strictly. 
8. If a student has attempted an extra question, answer of the question deserving more 
marks should be retained and the other answer scored out. 
9. No marks to be deducted for the cumulative effect of an error. It should be penalized only 
once. 
10. A full scale of marks 0-35 has to be used. Please do not hesitate to award full marks if the 
answer deserves it. 
11. Every examiner has to necessarily do evaluation work for full working hours i.e., 8 hours 
every day and evaluate 30 answer books per day in main subjects and 35 answer books 
per day in other subjects (Details are given in Spot Guidelines). This is in view of the 
reduced syllabus and number of questions in question paper. 
12. Ensure that you do not make the following common types of errors committed by the 
Examiner in the past:- 
? Leaving answer or part thereof unassessed in an answer book. 
Page 2


XII_39_043_56/1/1_Chemistry # Page-1 
 
  Strictly Confidential: (For Internal and Restricted use only) 
Senior Secondary School Term –II Examination, 2022 
Marking Scheme: CHEMISTRY (Subject Code: 043) 
[ Paper Code: 56/1/1] 
General Instructions: - 
 
1. You are aware that evaluation is the most important process in the actual and correct 
assessment of the candidates. A small mistake in evaluation may lead to serious 
problems which may affect the future of the candidates, education system and teaching 
profession. To avoid mistakes, it is requested that before starting evaluation, you must 
read and understand the spot evaluation guidelines carefully. 
2.  “Evaluation policy is a confidential policy as it is related to the confidentiality of 
the examinations conducted, Evaluation done and several other aspects. Its ’ 
leakage to public in any manner could lead to derailment of the examination system 
and affect the life and future of millions of candidates. Sharing this 
policy/document to anyone, publishing in any magazine and printing in News 
Paper/Website etc may invite action under IPC. ” 
3. Evaluation is to be done as per instructions provided in the Marking Scheme. It should not 
be done according to one’s own interpretation or any other consideration. Marking 
Scheme should be strictly adhered to and religiously followed. However, while 
evaluating, answers which are based on latest information or knowledge and/or are 
innovative, they may be assessed for their correctness otherwise and marks be 
awarded to them. In class-X, while evaluating two competency-based questions, 
please try to understand given answer and even if reply is not from marking 
scheme but correct competency is enumerated by the candidate, marks should be 
awarded.   
4. The Head-Examiner must go through the first five answer books evaluated by each 
evaluator on the first day, to ensure that evaluation has been carried out as per the 
instructions given in the Marking Scheme. The remaining answer books meant for 
evaluation shall be given only after ensuring that there is no significant variation in the 
marking of individual evaluators. 
5. Evaluators will mark( v ) wherever answer is correct.  For wrong answer ‘X” be marked.  
Evaluators will not put right kind of mark while evaluating which gives an impression that 
answer is correct and no marks are awarded.  This is most common mistake which 
evaluators are committing. 
6. If a question has parts, please award marks on the right-hand side for each part. Marks 
awarded for different parts of the question should then be totalled up and written in the 
left-hand margin and encircled.  This may be followed strictly. 
7. If a question does not have any parts, marks must be awarded in the left-hand margin and 
encircled. This may also be followed strictly. 
8. If a student has attempted an extra question, answer of the question deserving more 
marks should be retained and the other answer scored out. 
9. No marks to be deducted for the cumulative effect of an error. It should be penalized only 
once. 
10. A full scale of marks 0-35 has to be used. Please do not hesitate to award full marks if the 
answer deserves it. 
11. Every examiner has to necessarily do evaluation work for full working hours i.e., 8 hours 
every day and evaluate 30 answer books per day in main subjects and 35 answer books 
per day in other subjects (Details are given in Spot Guidelines). This is in view of the 
reduced syllabus and number of questions in question paper. 
12. Ensure that you do not make the following common types of errors committed by the 
Examiner in the past:- 
? Leaving answer or part thereof unassessed in an answer book. 
XII_39_043_56/1/1_Chemistry # Page-2 
 
? Giving more marks for an answer than assigned to it. 
? Wrong totaling of marks awarded on a reply. 
? Wrong transfer of marks from the inside pages of the answer book to the title page. 
? Wrong question wise totaling on the title page. 
? Wrong totaling of marks of the two columns on the title page. 
? Wrong grand total. 
? Marks in words and figures not tallying. 
? Wrong transfer of marks from the answer book to online award list. 
? Answers marked as correct, but marks not awarded. (Ensure that the right tick mark is 
correctly and clearly indicated. It should merely be a line. Same is with the X for 
incorrect answer.) 
? Half or a part of answer marked correct and the rest as wrong, but no marks awarded.  
 
13. While evaluating the answer books if the answer is found to be totally incorrect, it should 
be marked as cross (X) and awarded zero (0) Marks. 
  
14. Any unassessed portion, non-carrying over of marks to the title page, or totalling error 
detected by the candidate shall damage the prestige of all the personnel engaged in the 
evaluation work as also of the Board. Hence, in order to uphold the prestige of all 
concerned, it is again reiterated that the instructions be followed meticulously and 
judiciously. 
 
15. The Examiners should acquaint themselves with the guidelines given in the Guidelines for 
spot Evaluation before starting the actual evaluation. 
 
16. Every Examiner shall also ensure that all the answers are evaluated, marks carried over 
to the title page, correctly totalled and written in figures and words. 
 
17. The Board permits candidates to obtain photocopy of the Answer Book on request in an 
RTI application and also separately as a part of the re-evaluation process on payment of 
the processing charges.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Page 3


XII_39_043_56/1/1_Chemistry # Page-1 
 
  Strictly Confidential: (For Internal and Restricted use only) 
Senior Secondary School Term –II Examination, 2022 
Marking Scheme: CHEMISTRY (Subject Code: 043) 
[ Paper Code: 56/1/1] 
General Instructions: - 
 
1. You are aware that evaluation is the most important process in the actual and correct 
assessment of the candidates. A small mistake in evaluation may lead to serious 
problems which may affect the future of the candidates, education system and teaching 
profession. To avoid mistakes, it is requested that before starting evaluation, you must 
read and understand the spot evaluation guidelines carefully. 
2.  “Evaluation policy is a confidential policy as it is related to the confidentiality of 
the examinations conducted, Evaluation done and several other aspects. Its ’ 
leakage to public in any manner could lead to derailment of the examination system 
and affect the life and future of millions of candidates. Sharing this 
policy/document to anyone, publishing in any magazine and printing in News 
Paper/Website etc may invite action under IPC. ” 
3. Evaluation is to be done as per instructions provided in the Marking Scheme. It should not 
be done according to one’s own interpretation or any other consideration. Marking 
Scheme should be strictly adhered to and religiously followed. However, while 
evaluating, answers which are based on latest information or knowledge and/or are 
innovative, they may be assessed for their correctness otherwise and marks be 
awarded to them. In class-X, while evaluating two competency-based questions, 
please try to understand given answer and even if reply is not from marking 
scheme but correct competency is enumerated by the candidate, marks should be 
awarded.   
4. The Head-Examiner must go through the first five answer books evaluated by each 
evaluator on the first day, to ensure that evaluation has been carried out as per the 
instructions given in the Marking Scheme. The remaining answer books meant for 
evaluation shall be given only after ensuring that there is no significant variation in the 
marking of individual evaluators. 
5. Evaluators will mark( v ) wherever answer is correct.  For wrong answer ‘X” be marked.  
Evaluators will not put right kind of mark while evaluating which gives an impression that 
answer is correct and no marks are awarded.  This is most common mistake which 
evaluators are committing. 
6. If a question has parts, please award marks on the right-hand side for each part. Marks 
awarded for different parts of the question should then be totalled up and written in the 
left-hand margin and encircled.  This may be followed strictly. 
7. If a question does not have any parts, marks must be awarded in the left-hand margin and 
encircled. This may also be followed strictly. 
8. If a student has attempted an extra question, answer of the question deserving more 
marks should be retained and the other answer scored out. 
9. No marks to be deducted for the cumulative effect of an error. It should be penalized only 
once. 
10. A full scale of marks 0-35 has to be used. Please do not hesitate to award full marks if the 
answer deserves it. 
11. Every examiner has to necessarily do evaluation work for full working hours i.e., 8 hours 
every day and evaluate 30 answer books per day in main subjects and 35 answer books 
per day in other subjects (Details are given in Spot Guidelines). This is in view of the 
reduced syllabus and number of questions in question paper. 
12. Ensure that you do not make the following common types of errors committed by the 
Examiner in the past:- 
? Leaving answer or part thereof unassessed in an answer book. 
XII_39_043_56/1/1_Chemistry # Page-2 
 
? Giving more marks for an answer than assigned to it. 
? Wrong totaling of marks awarded on a reply. 
? Wrong transfer of marks from the inside pages of the answer book to the title page. 
? Wrong question wise totaling on the title page. 
? Wrong totaling of marks of the two columns on the title page. 
? Wrong grand total. 
? Marks in words and figures not tallying. 
? Wrong transfer of marks from the answer book to online award list. 
? Answers marked as correct, but marks not awarded. (Ensure that the right tick mark is 
correctly and clearly indicated. It should merely be a line. Same is with the X for 
incorrect answer.) 
? Half or a part of answer marked correct and the rest as wrong, but no marks awarded.  
 
13. While evaluating the answer books if the answer is found to be totally incorrect, it should 
be marked as cross (X) and awarded zero (0) Marks. 
  
14. Any unassessed portion, non-carrying over of marks to the title page, or totalling error 
detected by the candidate shall damage the prestige of all the personnel engaged in the 
evaluation work as also of the Board. Hence, in order to uphold the prestige of all 
concerned, it is again reiterated that the instructions be followed meticulously and 
judiciously. 
 
15. The Examiners should acquaint themselves with the guidelines given in the Guidelines for 
spot Evaluation before starting the actual evaluation. 
 
16. Every Examiner shall also ensure that all the answers are evaluated, marks carried over 
to the title page, correctly totalled and written in figures and words. 
 
17. The Board permits candidates to obtain photocopy of the Answer Book on request in an 
RTI application and also separately as a part of the re-evaluation process on payment of 
the processing charges.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
XII_39_043_56/1/1_Chemistry # Page-3 
 
MARKING SCHEME 
Senior Secondary School Examination TERM–II, 2022 
CHEMISTRY (Subject Code –043) 
[ Paper Code: 56/1/1] 
 
Q. No. EXPECTED ANSWER / VALUE POINTS Marks 
 
SECTION —A 
 
1. Decrease in concentration of reactant with time or increase in concentration of product 
with time. 
Factors: Concentration, temperature (or any other two factors). 
1 
 
½ + ½ 
2. (i) 
2 5 2 2 5 3 2 5 2
(C H ) NH (C H ) N C H NH ?? 
(ii) 
6 5 2 2 5 2 2 5 2
C H NH (C H ) NH C H NH ?? 
(iii) 
6 5 2 3 2 5 2
C H NH NH C H NH ?? 
(Any two) 1×2 
3. 2
º
cell cell
2
0·059 [Zn ]
log
2
[Cu ]
EE
?
?
?? or any other correct mathematical expression of Nernst 
equation. 
(i) 
cell
E will increase 
(ii) 
cell
E will decrease 
1 
 
 
½+½ 
 SECTION —B  
4. 
(i) 
3
Cr
?
, due to stable 
3
2g
t configuration. 
(ii) 
3
Mn
?
, as Mn is more stable in +2 oxidation state / stable half-filled d
5
 
configuration of Mn
2+
. 
(iii) 
4
Ti
?
, no unpaired electrons / no d-d transition / d
0
 configuration. 
½+½ 
 
½+½ 
 
½+½ 
5. 
(a) (i)  
31
2gg
te 
      (ii) 
2
d sp , diamagnetic 
      (iii) [CoCl
2
(en)
2
]
+ 
  
1 
 
½+½ 
 
1 
5. OR 
(b) (i) 
2 6 2
[Ni(H O) ]Cl 
     (ii)  6 
    (iii) hexaaquanickel(II) chloride 
 
1 
1 
1 
6.  
t
1/2
 = 0.693/k 
k = 0.693/t
1/2 
 = 0.693/40 min
-1
                                                                            
90% completion 
t = 2.303/k log [R
0
]/[R] 
  = 2.303/0.693 x 40 x log 100/10                                                                 
  = 2.303/0.693 x 40 = 132.9 min                       (Deduct ½ marks if no or incorrect unit) 
                                                                                    (or any other correct method) 
 
½ 
½ 
 
1 
 
1 
 
 
Page 4


XII_39_043_56/1/1_Chemistry # Page-1 
 
  Strictly Confidential: (For Internal and Restricted use only) 
Senior Secondary School Term –II Examination, 2022 
Marking Scheme: CHEMISTRY (Subject Code: 043) 
[ Paper Code: 56/1/1] 
General Instructions: - 
 
1. You are aware that evaluation is the most important process in the actual and correct 
assessment of the candidates. A small mistake in evaluation may lead to serious 
problems which may affect the future of the candidates, education system and teaching 
profession. To avoid mistakes, it is requested that before starting evaluation, you must 
read and understand the spot evaluation guidelines carefully. 
2.  “Evaluation policy is a confidential policy as it is related to the confidentiality of 
the examinations conducted, Evaluation done and several other aspects. Its ’ 
leakage to public in any manner could lead to derailment of the examination system 
and affect the life and future of millions of candidates. Sharing this 
policy/document to anyone, publishing in any magazine and printing in News 
Paper/Website etc may invite action under IPC. ” 
3. Evaluation is to be done as per instructions provided in the Marking Scheme. It should not 
be done according to one’s own interpretation or any other consideration. Marking 
Scheme should be strictly adhered to and religiously followed. However, while 
evaluating, answers which are based on latest information or knowledge and/or are 
innovative, they may be assessed for their correctness otherwise and marks be 
awarded to them. In class-X, while evaluating two competency-based questions, 
please try to understand given answer and even if reply is not from marking 
scheme but correct competency is enumerated by the candidate, marks should be 
awarded.   
4. The Head-Examiner must go through the first five answer books evaluated by each 
evaluator on the first day, to ensure that evaluation has been carried out as per the 
instructions given in the Marking Scheme. The remaining answer books meant for 
evaluation shall be given only after ensuring that there is no significant variation in the 
marking of individual evaluators. 
5. Evaluators will mark( v ) wherever answer is correct.  For wrong answer ‘X” be marked.  
Evaluators will not put right kind of mark while evaluating which gives an impression that 
answer is correct and no marks are awarded.  This is most common mistake which 
evaluators are committing. 
6. If a question has parts, please award marks on the right-hand side for each part. Marks 
awarded for different parts of the question should then be totalled up and written in the 
left-hand margin and encircled.  This may be followed strictly. 
7. If a question does not have any parts, marks must be awarded in the left-hand margin and 
encircled. This may also be followed strictly. 
8. If a student has attempted an extra question, answer of the question deserving more 
marks should be retained and the other answer scored out. 
9. No marks to be deducted for the cumulative effect of an error. It should be penalized only 
once. 
10. A full scale of marks 0-35 has to be used. Please do not hesitate to award full marks if the 
answer deserves it. 
11. Every examiner has to necessarily do evaluation work for full working hours i.e., 8 hours 
every day and evaluate 30 answer books per day in main subjects and 35 answer books 
per day in other subjects (Details are given in Spot Guidelines). This is in view of the 
reduced syllabus and number of questions in question paper. 
12. Ensure that you do not make the following common types of errors committed by the 
Examiner in the past:- 
? Leaving answer or part thereof unassessed in an answer book. 
XII_39_043_56/1/1_Chemistry # Page-2 
 
? Giving more marks for an answer than assigned to it. 
? Wrong totaling of marks awarded on a reply. 
? Wrong transfer of marks from the inside pages of the answer book to the title page. 
? Wrong question wise totaling on the title page. 
? Wrong totaling of marks of the two columns on the title page. 
? Wrong grand total. 
? Marks in words and figures not tallying. 
? Wrong transfer of marks from the answer book to online award list. 
? Answers marked as correct, but marks not awarded. (Ensure that the right tick mark is 
correctly and clearly indicated. It should merely be a line. Same is with the X for 
incorrect answer.) 
? Half or a part of answer marked correct and the rest as wrong, but no marks awarded.  
 
13. While evaluating the answer books if the answer is found to be totally incorrect, it should 
be marked as cross (X) and awarded zero (0) Marks. 
  
14. Any unassessed portion, non-carrying over of marks to the title page, or totalling error 
detected by the candidate shall damage the prestige of all the personnel engaged in the 
evaluation work as also of the Board. Hence, in order to uphold the prestige of all 
concerned, it is again reiterated that the instructions be followed meticulously and 
judiciously. 
 
15. The Examiners should acquaint themselves with the guidelines given in the Guidelines for 
spot Evaluation before starting the actual evaluation. 
 
16. Every Examiner shall also ensure that all the answers are evaluated, marks carried over 
to the title page, correctly totalled and written in figures and words. 
 
17. The Board permits candidates to obtain photocopy of the Answer Book on request in an 
RTI application and also separately as a part of the re-evaluation process on payment of 
the processing charges.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
XII_39_043_56/1/1_Chemistry # Page-3 
 
MARKING SCHEME 
Senior Secondary School Examination TERM–II, 2022 
CHEMISTRY (Subject Code –043) 
[ Paper Code: 56/1/1] 
 
Q. No. EXPECTED ANSWER / VALUE POINTS Marks 
 
SECTION —A 
 
1. Decrease in concentration of reactant with time or increase in concentration of product 
with time. 
Factors: Concentration, temperature (or any other two factors). 
1 
 
½ + ½ 
2. (i) 
2 5 2 2 5 3 2 5 2
(C H ) NH (C H ) N C H NH ?? 
(ii) 
6 5 2 2 5 2 2 5 2
C H NH (C H ) NH C H NH ?? 
(iii) 
6 5 2 3 2 5 2
C H NH NH C H NH ?? 
(Any two) 1×2 
3. 2
º
cell cell
2
0·059 [Zn ]
log
2
[Cu ]
EE
?
?
?? or any other correct mathematical expression of Nernst 
equation. 
(i) 
cell
E will increase 
(ii) 
cell
E will decrease 
1 
 
 
½+½ 
 SECTION —B  
4. 
(i) 
3
Cr
?
, due to stable 
3
2g
t configuration. 
(ii) 
3
Mn
?
, as Mn is more stable in +2 oxidation state / stable half-filled d
5
 
configuration of Mn
2+
. 
(iii) 
4
Ti
?
, no unpaired electrons / no d-d transition / d
0
 configuration. 
½+½ 
 
½+½ 
 
½+½ 
5. 
(a) (i)  
31
2gg
te 
      (ii) 
2
d sp , diamagnetic 
      (iii) [CoCl
2
(en)
2
]
+ 
  
1 
 
½+½ 
 
1 
5. OR 
(b) (i) 
2 6 2
[Ni(H O) ]Cl 
     (ii)  6 
    (iii) hexaaquanickel(II) chloride 
 
1 
1 
1 
6.  
t
1/2
 = 0.693/k 
k = 0.693/t
1/2 
 = 0.693/40 min
-1
                                                                            
90% completion 
t = 2.303/k log [R
0
]/[R] 
  = 2.303/0.693 x 40 x log 100/10                                                                 
  = 2.303/0.693 x 40 = 132.9 min                       (Deduct ½ marks if no or incorrect unit) 
                                                                                    (or any other correct method) 
 
½ 
½ 
 
1 
 
1 
 
 
XII_39_043_56/1/1_Chemistry # Page-4 
 
 
7. 
 
 
 
 
 
 
 
(a) 
            
(i)
C
C
NH
O
O
aq. KOH
C
C
NK
O
O
?
R—X
–KX
C
C
N—R
O
O
aq. NaOH
COONa
COONa
R N + — H
2
 
(ii)   
 
         
       (iii) 
 
 
                                                                             (Balancing of equation is not necessary) 
 
 
 
1×3 
   
7. OR 
(b) (i)
3 2 3 2 2 2 3 2 2
CH CH CN CH CH CH NH CH CH CH OH A B C ? ? ?
 
    
(ii) A B = CH CONH = CH CH NH
3 2 3 2 2
C = CH CH NH—S—
3 2
O
O
 
½ x 3 
 
 
 
½ x 3 
 
8. (a)(i) Because of greater number of unpaired electrons which cause strong metallic 
 bonding / strong interatomic interaction forces.  
 (ii) Because of lanthanoid contraction / similar atomic or ionic radii / similar       
properties. 
  (iii) Because of high 
hyd
and low aH H ?? 
1 
 
1 
 
1 
 
8. OR 
(b) The elements with partially filled or incompletely filled d-subshell either in the 
ground state or in the oxidation state.  
  Zinc, cadmium and mercury are not considered as transition elements. 
    Due to d-d transition or presence of unpaired d electrons. 
 
1 
 
1 
1 
Page 5


XII_39_043_56/1/1_Chemistry # Page-1 
 
  Strictly Confidential: (For Internal and Restricted use only) 
Senior Secondary School Term –II Examination, 2022 
Marking Scheme: CHEMISTRY (Subject Code: 043) 
[ Paper Code: 56/1/1] 
General Instructions: - 
 
1. You are aware that evaluation is the most important process in the actual and correct 
assessment of the candidates. A small mistake in evaluation may lead to serious 
problems which may affect the future of the candidates, education system and teaching 
profession. To avoid mistakes, it is requested that before starting evaluation, you must 
read and understand the spot evaluation guidelines carefully. 
2.  “Evaluation policy is a confidential policy as it is related to the confidentiality of 
the examinations conducted, Evaluation done and several other aspects. Its ’ 
leakage to public in any manner could lead to derailment of the examination system 
and affect the life and future of millions of candidates. Sharing this 
policy/document to anyone, publishing in any magazine and printing in News 
Paper/Website etc may invite action under IPC. ” 
3. Evaluation is to be done as per instructions provided in the Marking Scheme. It should not 
be done according to one’s own interpretation or any other consideration. Marking 
Scheme should be strictly adhered to and religiously followed. However, while 
evaluating, answers which are based on latest information or knowledge and/or are 
innovative, they may be assessed for their correctness otherwise and marks be 
awarded to them. In class-X, while evaluating two competency-based questions, 
please try to understand given answer and even if reply is not from marking 
scheme but correct competency is enumerated by the candidate, marks should be 
awarded.   
4. The Head-Examiner must go through the first five answer books evaluated by each 
evaluator on the first day, to ensure that evaluation has been carried out as per the 
instructions given in the Marking Scheme. The remaining answer books meant for 
evaluation shall be given only after ensuring that there is no significant variation in the 
marking of individual evaluators. 
5. Evaluators will mark( v ) wherever answer is correct.  For wrong answer ‘X” be marked.  
Evaluators will not put right kind of mark while evaluating which gives an impression that 
answer is correct and no marks are awarded.  This is most common mistake which 
evaluators are committing. 
6. If a question has parts, please award marks on the right-hand side for each part. Marks 
awarded for different parts of the question should then be totalled up and written in the 
left-hand margin and encircled.  This may be followed strictly. 
7. If a question does not have any parts, marks must be awarded in the left-hand margin and 
encircled. This may also be followed strictly. 
8. If a student has attempted an extra question, answer of the question deserving more 
marks should be retained and the other answer scored out. 
9. No marks to be deducted for the cumulative effect of an error. It should be penalized only 
once. 
10. A full scale of marks 0-35 has to be used. Please do not hesitate to award full marks if the 
answer deserves it. 
11. Every examiner has to necessarily do evaluation work for full working hours i.e., 8 hours 
every day and evaluate 30 answer books per day in main subjects and 35 answer books 
per day in other subjects (Details are given in Spot Guidelines). This is in view of the 
reduced syllabus and number of questions in question paper. 
12. Ensure that you do not make the following common types of errors committed by the 
Examiner in the past:- 
? Leaving answer or part thereof unassessed in an answer book. 
XII_39_043_56/1/1_Chemistry # Page-2 
 
? Giving more marks for an answer than assigned to it. 
? Wrong totaling of marks awarded on a reply. 
? Wrong transfer of marks from the inside pages of the answer book to the title page. 
? Wrong question wise totaling on the title page. 
? Wrong totaling of marks of the two columns on the title page. 
? Wrong grand total. 
? Marks in words and figures not tallying. 
? Wrong transfer of marks from the answer book to online award list. 
? Answers marked as correct, but marks not awarded. (Ensure that the right tick mark is 
correctly and clearly indicated. It should merely be a line. Same is with the X for 
incorrect answer.) 
? Half or a part of answer marked correct and the rest as wrong, but no marks awarded.  
 
13. While evaluating the answer books if the answer is found to be totally incorrect, it should 
be marked as cross (X) and awarded zero (0) Marks. 
  
14. Any unassessed portion, non-carrying over of marks to the title page, or totalling error 
detected by the candidate shall damage the prestige of all the personnel engaged in the 
evaluation work as also of the Board. Hence, in order to uphold the prestige of all 
concerned, it is again reiterated that the instructions be followed meticulously and 
judiciously. 
 
15. The Examiners should acquaint themselves with the guidelines given in the Guidelines for 
spot Evaluation before starting the actual evaluation. 
 
16. Every Examiner shall also ensure that all the answers are evaluated, marks carried over 
to the title page, correctly totalled and written in figures and words. 
 
17. The Board permits candidates to obtain photocopy of the Answer Book on request in an 
RTI application and also separately as a part of the re-evaluation process on payment of 
the processing charges.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
XII_39_043_56/1/1_Chemistry # Page-3 
 
MARKING SCHEME 
Senior Secondary School Examination TERM–II, 2022 
CHEMISTRY (Subject Code –043) 
[ Paper Code: 56/1/1] 
 
Q. No. EXPECTED ANSWER / VALUE POINTS Marks 
 
SECTION —A 
 
1. Decrease in concentration of reactant with time or increase in concentration of product 
with time. 
Factors: Concentration, temperature (or any other two factors). 
1 
 
½ + ½ 
2. (i) 
2 5 2 2 5 3 2 5 2
(C H ) NH (C H ) N C H NH ?? 
(ii) 
6 5 2 2 5 2 2 5 2
C H NH (C H ) NH C H NH ?? 
(iii) 
6 5 2 3 2 5 2
C H NH NH C H NH ?? 
(Any two) 1×2 
3. 2
º
cell cell
2
0·059 [Zn ]
log
2
[Cu ]
EE
?
?
?? or any other correct mathematical expression of Nernst 
equation. 
(i) 
cell
E will increase 
(ii) 
cell
E will decrease 
1 
 
 
½+½ 
 SECTION —B  
4. 
(i) 
3
Cr
?
, due to stable 
3
2g
t configuration. 
(ii) 
3
Mn
?
, as Mn is more stable in +2 oxidation state / stable half-filled d
5
 
configuration of Mn
2+
. 
(iii) 
4
Ti
?
, no unpaired electrons / no d-d transition / d
0
 configuration. 
½+½ 
 
½+½ 
 
½+½ 
5. 
(a) (i)  
31
2gg
te 
      (ii) 
2
d sp , diamagnetic 
      (iii) [CoCl
2
(en)
2
]
+ 
  
1 
 
½+½ 
 
1 
5. OR 
(b) (i) 
2 6 2
[Ni(H O) ]Cl 
     (ii)  6 
    (iii) hexaaquanickel(II) chloride 
 
1 
1 
1 
6.  
t
1/2
 = 0.693/k 
k = 0.693/t
1/2 
 = 0.693/40 min
-1
                                                                            
90% completion 
t = 2.303/k log [R
0
]/[R] 
  = 2.303/0.693 x 40 x log 100/10                                                                 
  = 2.303/0.693 x 40 = 132.9 min                       (Deduct ½ marks if no or incorrect unit) 
                                                                                    (or any other correct method) 
 
½ 
½ 
 
1 
 
1 
 
 
XII_39_043_56/1/1_Chemistry # Page-4 
 
 
7. 
 
 
 
 
 
 
 
(a) 
            
(i)
C
C
NH
O
O
aq. KOH
C
C
NK
O
O
?
R—X
–KX
C
C
N—R
O
O
aq. NaOH
COONa
COONa
R N + — H
2
 
(ii)   
 
         
       (iii) 
 
 
                                                                             (Balancing of equation is not necessary) 
 
 
 
1×3 
   
7. OR 
(b) (i)
3 2 3 2 2 2 3 2 2
CH CH CN CH CH CH NH CH CH CH OH A B C ? ? ?
 
    
(ii) A B = CH CONH = CH CH NH
3 2 3 2 2
C = CH CH NH—S—
3 2
O
O
 
½ x 3 
 
 
 
½ x 3 
 
8. (a)(i) Because of greater number of unpaired electrons which cause strong metallic 
 bonding / strong interatomic interaction forces.  
 (ii) Because of lanthanoid contraction / similar atomic or ionic radii / similar       
properties. 
  (iii) Because of high 
hyd
and low aH H ?? 
1 
 
1 
 
1 
 
8. OR 
(b) The elements with partially filled or incompletely filled d-subshell either in the 
ground state or in the oxidation state.  
  Zinc, cadmium and mercury are not considered as transition elements. 
    Due to d-d transition or presence of unpaired d electrons. 
 
1 
 
1 
1 
XII_39_043_56/1/1_Chemistry # Page-5 
 
9. 
CH —C—CH —CH —CH
3 2 2 3
O
(ii) CH —C      O   +   H N—NH—
3 2
CH —CH —CH
2 2 3
NO
2
(i)
—NO
2
CH —C      NNH—
3
NO
2
—NH
2
CH CH CH
2 2 3
(Product)
(iii) CH —CH CH COONa + CHI
3 2 2 3
 
1 
 
 
 
 
 
 
1 
 
 
 
 
 
½+½ 
10. 
 
 
 
 
 
(a) 
 Physisorption Chemisorption 
1. Arise from weak van der Waals forces Strong chemical bonds 
2. Reversible Irreversible 
3. Multimolecular layers Unimolecular layer 
                                                                                          (or any other correct difference) 
 
 
 
 
 
 
1×3 
10.  OR 
 (b) (i) The colloids in which the particles of dispersed phase have more affinity    
towards dispersion medium. Example: Gum.  
(ii) The colloids obtained by dissolving macromolecules in suitable solvents.       
Example: Starch. 
(iii) The settling of colloidal particles / conversion of colloidal sol into precipitate.  
Example: Electrophoresis.  
                                                                    (Any other suitable example in each case) 
 
½+½ 
 
½+½ 
 
½+½ 
11. 
(a) 
ºº
r cell
G nFE ? ? ? 
 
3 1 1 º
cell
º
cell
300 10 J mol 2 96500 C mol
3 00
E
E
??
? ? ? ? ? ? ? ??
?
3
10
2 965 00
?
?
º
cell
V
1 ·55 V E ?
 
                                                                      (Deduct ½ mark for incorrect unit or no unit)  
(b) 
2
º º º
m
Mg Cl
2
??
? ? ? ? ? 
 
º 2 1
m
º 2 1
m
º 2 1
m
(106 2 76·3) S cm mol
(106 152·6) S cm mol
258·6 S cm mol
?
?
?
? ? ? ?
? ? ?
??
 
½ 
 
½ 
 
 
 
1 
 
 
½ 
 
 
 
 
½ 
12. (a) 
6 5 3 3 3 3
C H COCH CH COCH CH CHO HCHO ? ? ? 
(b) On heating with Tollens’ reagent, ethanal forms silver mirror whereas propanone        
does not.                                                    (Or any other correct chemical test) 
(c) Because of resonance by —OH of COOH which reduces the electrophilicity of 
carboxyl carbon / Because of resonance in COOH group due to which carbon loses 
its carbonyl nature.  
1 
 
1 
 
 
1