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JAM 2021  CHEMISTRY - CY 
CY 1/21 
Paper Specific Instructions 
 
1. The examination is of 3 hours duration. There are a total of 60 questions carrying 100 marks. The entire 
paper is divided into three sections, A, B and C. All sections are compulsory. Questions in each section are 
of different types. 
 
2. Section – A contains a total of 30 Multiple Choice Questions (MCQ). Each MCQ type question has four 
choices out of which only one choice is the correct answer. Questions Q.1 – Q.30 belong to this section 
and carry a total of 50 marks. Q.1 – Q.10 carry 1 mark each and Questions Q.11 – Q.30 carry 2 marks 
each. 
 
3. Section – B contains a total of 10 Multiple Select Questions (MSQ). Each MSQ type question is similar 
to MCQ but with a difference that there may be one or more than one choice(s) that are correct out of the 
four given choices. The candidate gets full credit if he/she selects all the correct answers only and no 
wrong answers. Questions Q.31 – Q.40 belong to this section and carry 2 marks each with a total of 20 
marks. 
 
4. Section – C contains a total of 20 Numerical Answer Type (NAT) questions. For these NAT type 
questions, the answer is a real number which needs to be entered using the virtual keyboard on the monitor. 
No choices will be shown for these type of questions. Questions Q.41 – Q.60 belong to this section and 
carry a total of 30 marks. Q.41 – Q.50 carry 1 mark each and Questions Q.51 – Q.60 carry 2 marks each.  
 
5. In all sections, questions not attempted will result in zero mark. In Section – A (MCQ), wrong answer will 
result in NEGATIVE marks. For all 1 mark questions, 1/3 marks will be deducted for each wrong answer. 
For all 2 marks questions, 2/3 marks will be deducted for each wrong answer. In Section – B (MSQ), there 
is NO NEGATIVE and NO PARTIAL marking provisions. There is NO NEGATIVE marking in 
Section – C (NAT) as well. 
 
6. Only Virtual Scientific Calculator is allowed. Charts, graph sheets, tables, cellular phone or other 
electronic gadgets are NOT allowed in the examination hall. 
 
 
7. The Scribble Pad will be provided for rough work. 
 
 
 
 
 
 
 
  
Page 2


JAM 2021  CHEMISTRY - CY 
CY 1/21 
Paper Specific Instructions 
 
1. The examination is of 3 hours duration. There are a total of 60 questions carrying 100 marks. The entire 
paper is divided into three sections, A, B and C. All sections are compulsory. Questions in each section are 
of different types. 
 
2. Section – A contains a total of 30 Multiple Choice Questions (MCQ). Each MCQ type question has four 
choices out of which only one choice is the correct answer. Questions Q.1 – Q.30 belong to this section 
and carry a total of 50 marks. Q.1 – Q.10 carry 1 mark each and Questions Q.11 – Q.30 carry 2 marks 
each. 
 
3. Section – B contains a total of 10 Multiple Select Questions (MSQ). Each MSQ type question is similar 
to MCQ but with a difference that there may be one or more than one choice(s) that are correct out of the 
four given choices. The candidate gets full credit if he/she selects all the correct answers only and no 
wrong answers. Questions Q.31 – Q.40 belong to this section and carry 2 marks each with a total of 20 
marks. 
 
4. Section – C contains a total of 20 Numerical Answer Type (NAT) questions. For these NAT type 
questions, the answer is a real number which needs to be entered using the virtual keyboard on the monitor. 
No choices will be shown for these type of questions. Questions Q.41 – Q.60 belong to this section and 
carry a total of 30 marks. Q.41 – Q.50 carry 1 mark each and Questions Q.51 – Q.60 carry 2 marks each.  
 
5. In all sections, questions not attempted will result in zero mark. In Section – A (MCQ), wrong answer will 
result in NEGATIVE marks. For all 1 mark questions, 1/3 marks will be deducted for each wrong answer. 
For all 2 marks questions, 2/3 marks will be deducted for each wrong answer. In Section – B (MSQ), there 
is NO NEGATIVE and NO PARTIAL marking provisions. There is NO NEGATIVE marking in 
Section – C (NAT) as well. 
 
6. Only Virtual Scientific Calculator is allowed. Charts, graph sheets, tables, cellular phone or other 
electronic gadgets are NOT allowed in the examination hall. 
 
 
7. The Scribble Pad will be provided for rough work. 
 
 
 
 
 
 
 
  
JAM 2021  CHEMISTRY - CY 
CY 2/21 
SECTION – A 
MULTIPLE CHOICE QUESTIONS (MCQ) 
Q. 1 – Q.10 carry one mark each. 
Q.1   The CORRECT order of pKa for the compounds I to IV in water at 298 K is 
 
 
 
(A) I > II > III > IV (B) IV > III > II > I 
 
(C) IV > II > III > I (D) I > III > II > IV 
 
 
 
Q.2  For Na
+
, Mg
2+
, Al
3+
 and F
-
, the CORRECT order of ionic radii is 
 
(A) Al
3+
 > Mg
2+
 > Na
+
 > F
-
 (B) Al
3+
 > Na
+ 
> Mg
2+ 
> F
- 
 
(C) F
- 
> Na
+ 
> Mg
2+ 
> Al
3+
 (D) Na
+ 
> F
- 
> Mg
2+ 
> Al
3+
 
 
 
 
Q.3  Spin-only magnetic moments (in BM) of [NiCl 2(PPh3)2] and [Mn(NCS)6]
4 -
, respectively, 
are   
 
(A) 0.00 and 5.92 (B) 2.83  and 1.89 
 
(C) 0.00  and 1.89 (D) 2.83  and 5.92 
 
 
 
Q.4  Two sets of quantum numbers with the same number of radial nodes are 
 
(A) n = 3; l = 0; m l  = 0       and     n = 2; l = 0; m l  = 0 
 
(B) n = 3; l = 1; m l  = 1       and     n = 2; l = 1; m l  = 0 
 
(C) n = 3; l = 2; m l  = 0       and     n = 2; l = 1; m l  = 0 
 
(D) n = 3; l = 1; m l  = -1     and     n = 2; l = 1; m l  = 0 
 
 
 
 
 
 
 
 
Page 3


JAM 2021  CHEMISTRY - CY 
CY 1/21 
Paper Specific Instructions 
 
1. The examination is of 3 hours duration. There are a total of 60 questions carrying 100 marks. The entire 
paper is divided into three sections, A, B and C. All sections are compulsory. Questions in each section are 
of different types. 
 
2. Section – A contains a total of 30 Multiple Choice Questions (MCQ). Each MCQ type question has four 
choices out of which only one choice is the correct answer. Questions Q.1 – Q.30 belong to this section 
and carry a total of 50 marks. Q.1 – Q.10 carry 1 mark each and Questions Q.11 – Q.30 carry 2 marks 
each. 
 
3. Section – B contains a total of 10 Multiple Select Questions (MSQ). Each MSQ type question is similar 
to MCQ but with a difference that there may be one or more than one choice(s) that are correct out of the 
four given choices. The candidate gets full credit if he/she selects all the correct answers only and no 
wrong answers. Questions Q.31 – Q.40 belong to this section and carry 2 marks each with a total of 20 
marks. 
 
4. Section – C contains a total of 20 Numerical Answer Type (NAT) questions. For these NAT type 
questions, the answer is a real number which needs to be entered using the virtual keyboard on the monitor. 
No choices will be shown for these type of questions. Questions Q.41 – Q.60 belong to this section and 
carry a total of 30 marks. Q.41 – Q.50 carry 1 mark each and Questions Q.51 – Q.60 carry 2 marks each.  
 
5. In all sections, questions not attempted will result in zero mark. In Section – A (MCQ), wrong answer will 
result in NEGATIVE marks. For all 1 mark questions, 1/3 marks will be deducted for each wrong answer. 
For all 2 marks questions, 2/3 marks will be deducted for each wrong answer. In Section – B (MSQ), there 
is NO NEGATIVE and NO PARTIAL marking provisions. There is NO NEGATIVE marking in 
Section – C (NAT) as well. 
 
6. Only Virtual Scientific Calculator is allowed. Charts, graph sheets, tables, cellular phone or other 
electronic gadgets are NOT allowed in the examination hall. 
 
 
7. The Scribble Pad will be provided for rough work. 
 
 
 
 
 
 
 
  
JAM 2021  CHEMISTRY - CY 
CY 2/21 
SECTION – A 
MULTIPLE CHOICE QUESTIONS (MCQ) 
Q. 1 – Q.10 carry one mark each. 
Q.1   The CORRECT order of pKa for the compounds I to IV in water at 298 K is 
 
 
 
(A) I > II > III > IV (B) IV > III > II > I 
 
(C) IV > II > III > I (D) I > III > II > IV 
 
 
 
Q.2  For Na
+
, Mg
2+
, Al
3+
 and F
-
, the CORRECT order of ionic radii is 
 
(A) Al
3+
 > Mg
2+
 > Na
+
 > F
-
 (B) Al
3+
 > Na
+ 
> Mg
2+ 
> F
- 
 
(C) F
- 
> Na
+ 
> Mg
2+ 
> Al
3+
 (D) Na
+ 
> F
- 
> Mg
2+ 
> Al
3+
 
 
 
 
Q.3  Spin-only magnetic moments (in BM) of [NiCl 2(PPh3)2] and [Mn(NCS)6]
4 -
, respectively, 
are   
 
(A) 0.00 and 5.92 (B) 2.83  and 1.89 
 
(C) 0.00  and 1.89 (D) 2.83  and 5.92 
 
 
 
Q.4  Two sets of quantum numbers with the same number of radial nodes are 
 
(A) n = 3; l = 0; m l  = 0       and     n = 2; l = 0; m l  = 0 
 
(B) n = 3; l = 1; m l  = 1       and     n = 2; l = 1; m l  = 0 
 
(C) n = 3; l = 2; m l  = 0       and     n = 2; l = 1; m l  = 0 
 
(D) n = 3; l = 1; m l  = -1     and     n = 2; l = 1; m l  = 0 
 
 
 
 
 
 
 
 
JAM 2021  CHEMISTRY - CY 
CY 3/21 
Q.5  The major product formed in the following reaction is 
 
  
 
(A)  
 
(B)  
 
    
(C)  
 
(D)  
 
 
 
 
 
Q.6  The major product formed in the following reaction is 
 
 
 
(A)  
 
(B)  
 
    
(C)  
 
(D)  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Page 4


JAM 2021  CHEMISTRY - CY 
CY 1/21 
Paper Specific Instructions 
 
1. The examination is of 3 hours duration. There are a total of 60 questions carrying 100 marks. The entire 
paper is divided into three sections, A, B and C. All sections are compulsory. Questions in each section are 
of different types. 
 
2. Section – A contains a total of 30 Multiple Choice Questions (MCQ). Each MCQ type question has four 
choices out of which only one choice is the correct answer. Questions Q.1 – Q.30 belong to this section 
and carry a total of 50 marks. Q.1 – Q.10 carry 1 mark each and Questions Q.11 – Q.30 carry 2 marks 
each. 
 
3. Section – B contains a total of 10 Multiple Select Questions (MSQ). Each MSQ type question is similar 
to MCQ but with a difference that there may be one or more than one choice(s) that are correct out of the 
four given choices. The candidate gets full credit if he/she selects all the correct answers only and no 
wrong answers. Questions Q.31 – Q.40 belong to this section and carry 2 marks each with a total of 20 
marks. 
 
4. Section – C contains a total of 20 Numerical Answer Type (NAT) questions. For these NAT type 
questions, the answer is a real number which needs to be entered using the virtual keyboard on the monitor. 
No choices will be shown for these type of questions. Questions Q.41 – Q.60 belong to this section and 
carry a total of 30 marks. Q.41 – Q.50 carry 1 mark each and Questions Q.51 – Q.60 carry 2 marks each.  
 
5. In all sections, questions not attempted will result in zero mark. In Section – A (MCQ), wrong answer will 
result in NEGATIVE marks. For all 1 mark questions, 1/3 marks will be deducted for each wrong answer. 
For all 2 marks questions, 2/3 marks will be deducted for each wrong answer. In Section – B (MSQ), there 
is NO NEGATIVE and NO PARTIAL marking provisions. There is NO NEGATIVE marking in 
Section – C (NAT) as well. 
 
6. Only Virtual Scientific Calculator is allowed. Charts, graph sheets, tables, cellular phone or other 
electronic gadgets are NOT allowed in the examination hall. 
 
 
7. The Scribble Pad will be provided for rough work. 
 
 
 
 
 
 
 
  
JAM 2021  CHEMISTRY - CY 
CY 2/21 
SECTION – A 
MULTIPLE CHOICE QUESTIONS (MCQ) 
Q. 1 – Q.10 carry one mark each. 
Q.1   The CORRECT order of pKa for the compounds I to IV in water at 298 K is 
 
 
 
(A) I > II > III > IV (B) IV > III > II > I 
 
(C) IV > II > III > I (D) I > III > II > IV 
 
 
 
Q.2  For Na
+
, Mg
2+
, Al
3+
 and F
-
, the CORRECT order of ionic radii is 
 
(A) Al
3+
 > Mg
2+
 > Na
+
 > F
-
 (B) Al
3+
 > Na
+ 
> Mg
2+ 
> F
- 
 
(C) F
- 
> Na
+ 
> Mg
2+ 
> Al
3+
 (D) Na
+ 
> F
- 
> Mg
2+ 
> Al
3+
 
 
 
 
Q.3  Spin-only magnetic moments (in BM) of [NiCl 2(PPh3)2] and [Mn(NCS)6]
4 -
, respectively, 
are   
 
(A) 0.00 and 5.92 (B) 2.83  and 1.89 
 
(C) 0.00  and 1.89 (D) 2.83  and 5.92 
 
 
 
Q.4  Two sets of quantum numbers with the same number of radial nodes are 
 
(A) n = 3; l = 0; m l  = 0       and     n = 2; l = 0; m l  = 0 
 
(B) n = 3; l = 1; m l  = 1       and     n = 2; l = 1; m l  = 0 
 
(C) n = 3; l = 2; m l  = 0       and     n = 2; l = 1; m l  = 0 
 
(D) n = 3; l = 1; m l  = -1     and     n = 2; l = 1; m l  = 0 
 
 
 
 
 
 
 
 
JAM 2021  CHEMISTRY - CY 
CY 3/21 
Q.5  The major product formed in the following reaction is 
 
  
 
(A)  
 
(B)  
 
    
(C)  
 
(D)  
 
 
 
 
 
Q.6  The major product formed in the following reaction is 
 
 
 
(A)  
 
(B)  
 
    
(C)  
 
(D)  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
JAM 2021  CHEMISTRY - CY 
CY 4/21 
Q.7  A compound shows 
1
H NMR peaks at d-values (in ppm) 7.31 (2H), 7.21 (2H), 4.5 (2H) and 
2.3 (3H). The structure of the compound is  
  
(A)  
 
(B)  
 
    
    
(C)   
 
(D)  
 
 
 
 
Q.8  The major product formed in the following reaction is 
 
            
 
 
(A)   
 
(B)   
 
    
    
(C)   
 
(D)  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Page 5


JAM 2021  CHEMISTRY - CY 
CY 1/21 
Paper Specific Instructions 
 
1. The examination is of 3 hours duration. There are a total of 60 questions carrying 100 marks. The entire 
paper is divided into three sections, A, B and C. All sections are compulsory. Questions in each section are 
of different types. 
 
2. Section – A contains a total of 30 Multiple Choice Questions (MCQ). Each MCQ type question has four 
choices out of which only one choice is the correct answer. Questions Q.1 – Q.30 belong to this section 
and carry a total of 50 marks. Q.1 – Q.10 carry 1 mark each and Questions Q.11 – Q.30 carry 2 marks 
each. 
 
3. Section – B contains a total of 10 Multiple Select Questions (MSQ). Each MSQ type question is similar 
to MCQ but with a difference that there may be one or more than one choice(s) that are correct out of the 
four given choices. The candidate gets full credit if he/she selects all the correct answers only and no 
wrong answers. Questions Q.31 – Q.40 belong to this section and carry 2 marks each with a total of 20 
marks. 
 
4. Section – C contains a total of 20 Numerical Answer Type (NAT) questions. For these NAT type 
questions, the answer is a real number which needs to be entered using the virtual keyboard on the monitor. 
No choices will be shown for these type of questions. Questions Q.41 – Q.60 belong to this section and 
carry a total of 30 marks. Q.41 – Q.50 carry 1 mark each and Questions Q.51 – Q.60 carry 2 marks each.  
 
5. In all sections, questions not attempted will result in zero mark. In Section – A (MCQ), wrong answer will 
result in NEGATIVE marks. For all 1 mark questions, 1/3 marks will be deducted for each wrong answer. 
For all 2 marks questions, 2/3 marks will be deducted for each wrong answer. In Section – B (MSQ), there 
is NO NEGATIVE and NO PARTIAL marking provisions. There is NO NEGATIVE marking in 
Section – C (NAT) as well. 
 
6. Only Virtual Scientific Calculator is allowed. Charts, graph sheets, tables, cellular phone or other 
electronic gadgets are NOT allowed in the examination hall. 
 
 
7. The Scribble Pad will be provided for rough work. 
 
 
 
 
 
 
 
  
JAM 2021  CHEMISTRY - CY 
CY 2/21 
SECTION – A 
MULTIPLE CHOICE QUESTIONS (MCQ) 
Q. 1 – Q.10 carry one mark each. 
Q.1   The CORRECT order of pKa for the compounds I to IV in water at 298 K is 
 
 
 
(A) I > II > III > IV (B) IV > III > II > I 
 
(C) IV > II > III > I (D) I > III > II > IV 
 
 
 
Q.2  For Na
+
, Mg
2+
, Al
3+
 and F
-
, the CORRECT order of ionic radii is 
 
(A) Al
3+
 > Mg
2+
 > Na
+
 > F
-
 (B) Al
3+
 > Na
+ 
> Mg
2+ 
> F
- 
 
(C) F
- 
> Na
+ 
> Mg
2+ 
> Al
3+
 (D) Na
+ 
> F
- 
> Mg
2+ 
> Al
3+
 
 
 
 
Q.3  Spin-only magnetic moments (in BM) of [NiCl 2(PPh3)2] and [Mn(NCS)6]
4 -
, respectively, 
are   
 
(A) 0.00 and 5.92 (B) 2.83  and 1.89 
 
(C) 0.00  and 1.89 (D) 2.83  and 5.92 
 
 
 
Q.4  Two sets of quantum numbers with the same number of radial nodes are 
 
(A) n = 3; l = 0; m l  = 0       and     n = 2; l = 0; m l  = 0 
 
(B) n = 3; l = 1; m l  = 1       and     n = 2; l = 1; m l  = 0 
 
(C) n = 3; l = 2; m l  = 0       and     n = 2; l = 1; m l  = 0 
 
(D) n = 3; l = 1; m l  = -1     and     n = 2; l = 1; m l  = 0 
 
 
 
 
 
 
 
 
JAM 2021  CHEMISTRY - CY 
CY 3/21 
Q.5  The major product formed in the following reaction is 
 
  
 
(A)  
 
(B)  
 
    
(C)  
 
(D)  
 
 
 
 
 
Q.6  The major product formed in the following reaction is 
 
 
 
(A)  
 
(B)  
 
    
(C)  
 
(D)  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
JAM 2021  CHEMISTRY - CY 
CY 4/21 
Q.7  A compound shows 
1
H NMR peaks at d-values (in ppm) 7.31 (2H), 7.21 (2H), 4.5 (2H) and 
2.3 (3H). The structure of the compound is  
  
(A)  
 
(B)  
 
    
    
(C)   
 
(D)  
 
 
 
 
Q.8  The major product formed in the following reaction is 
 
            
 
 
(A)   
 
(B)   
 
    
    
(C)   
 
(D)  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
JAM 2021  CHEMISTRY - CY 
CY 5/21 
Q.9  A pure substance M has lesser density in solid state than in liquid state. The ?S fusion of M 
is +25 J K
-1 
mol
-1
. The CORRECT representative Pressure-Temperature diagram for the 
fusion of M is  
 
(A)  
 
(B)  
 
    
(C)  
 
(D)  
 
 
 
 
Q.10  Among the following, the matrices with non-zero determinant are  
 
 
 
                                                                                    
(A) P, Q and R 
 
(B) P, R and S 
(C) P, Q and S (D) Q, R and S 
 
 
 
 
 
 
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FAQs on Chemistry - 2021 Past Year Paper - IIT JAM Chemistry Past Year Papers

1. What are the properties of acids and bases?
Ans. Acids are substances that release hydrogen ions (H+) when dissolved in water, and they have a sour taste. Bases, on the other hand, are substances that release hydroxide ions (OH-) when dissolved in water, and they have a bitter taste and slippery texture. Acids turn blue litmus paper red, while bases turn red litmus paper blue.
2. How do acids and bases react with each other?
Ans. Acids and bases can react with each other in a process called neutralization. When an acid reacts with a base, they undergo a chemical reaction to form a salt and water. The hydrogen ions (H+) from the acid combine with the hydroxide ions (OH-) from the base to form water, while the remaining ions form the salt.
3. What is the pH scale and how is it used to measure acidity and alkalinity?
Ans. The pH scale is a measure of the acidity or alkalinity of a solution. It ranges from 0 to 14, with 0 being highly acidic, 7 being neutral, and 14 being highly alkaline. The pH value is determined by the concentration of hydrogen ions (H+) in the solution. A pH value below 7 indicates acidity, while a pH value above 7 indicates alkalinity.
4. How does the concentration of an acid or base affect its pH?
Ans. The concentration of an acid or base directly affects its pH value. Generally, higher concentrations of acids result in lower pH values, making the solution more acidic. Conversely, higher concentrations of bases result in higher pH values, making the solution more alkaline. This relationship is based on the concentration of hydrogen ions (H+) or hydroxide ions (OH-) present in the solution.
5. What are some common examples of acids and bases?
Ans. Some common examples of acids include vinegar (acetic acid), lemon juice (citric acid), and hydrochloric acid. Examples of bases include baking soda (sodium bicarbonate), soap, and ammonia. These substances can be found in various household products and are widely used in everyday life.
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