JEE Main 2021 Answer Key Chemistry - Morning Shift (17-03-2021) JEE Notes | EduRev

Mock Test Series for JEE Main & Advanced 2022

JEE : JEE Main 2021 Answer Key Chemistry - Morning Shift (17-03-2021) JEE Notes | EduRev

 Page 1


 
 
17
th
 March. 2021 | Shift 1 
SECTION - A 
 
Q.1.  The INCORRECT statement(s) about heavy water is (are) 
(A) Used as moderator in nuclear reactor 
(B) Obtained as a by-product in fertilizer industry 
(C) used for the study of reaction mechanism 
(D) has a higher dielectric constant than water 
Choose the correct answer from the option given below: 
(1) (B) only   
(2) (B) and (D) only   
(3) (C) only   
(4) (D) only  
Ans. (4) 
Sol. D
2
O = 78.06 (Dielectric constant) 
 H
2
O = 78.39 (Dielectric constant) 
 
Q.2.  Given below are two statements: 
Statement I : Potassium permanganate on heating at 573 K forms 
potassium manganate. 
Statement II :Both potassium permanganate and potassium manganate are 
tetrahedral and paramagnetic in nature. 
In the light of the above statements, choose the most appropriate answer 
from the options given below: 
(1) Both statement I and statement II are true    
(2)Both statement I and statement II are false   
(3)statement I is true but and statement II isfalse    
(4)statement I is false but statement II is true 
Ans. (3) 
Sol. 
7
4
KMnO
?
 
573K
? ? ? ? ?
6
2 4
K MnO
?
+ MnO
2
 + O
2 
 Dimagnetic       Potassium  
       Manganate one  
      unpaired electron  
      (Paramagnetic) 
 
4
2 4
KMnO
K MnO
?
?
? ? ? ?
?
?
Both one tetrahedral  
 
 
 
 
 
Page 2


 
 
17
th
 March. 2021 | Shift 1 
SECTION - A 
 
Q.1.  The INCORRECT statement(s) about heavy water is (are) 
(A) Used as moderator in nuclear reactor 
(B) Obtained as a by-product in fertilizer industry 
(C) used for the study of reaction mechanism 
(D) has a higher dielectric constant than water 
Choose the correct answer from the option given below: 
(1) (B) only   
(2) (B) and (D) only   
(3) (C) only   
(4) (D) only  
Ans. (4) 
Sol. D
2
O = 78.06 (Dielectric constant) 
 H
2
O = 78.39 (Dielectric constant) 
 
Q.2.  Given below are two statements: 
Statement I : Potassium permanganate on heating at 573 K forms 
potassium manganate. 
Statement II :Both potassium permanganate and potassium manganate are 
tetrahedral and paramagnetic in nature. 
In the light of the above statements, choose the most appropriate answer 
from the options given below: 
(1) Both statement I and statement II are true    
(2)Both statement I and statement II are false   
(3)statement I is true but and statement II isfalse    
(4)statement I is false but statement II is true 
Ans. (3) 
Sol. 
7
4
KMnO
?
 
573K
? ? ? ? ?
6
2 4
K MnO
?
+ MnO
2
 + O
2 
 Dimagnetic       Potassium  
       Manganate one  
      unpaired electron  
      (Paramagnetic) 
 
4
2 4
KMnO
K MnO
?
?
? ? ? ?
?
?
Both one tetrahedral  
 
 
 
 
 
 
 
 
 
 
 
Q.3.  Which of the following is correct structure of tyrosine? 
(1)
 
COOH 
H H
2
N 
OH 
(2)
 
 
COOH 
H H
2
N 
OH 
   
(3)
 
COOH 
H H
2
N 
OH 
  (4) 
 
COOH 
H H
2
N 
OH 
 
Ans. (3) 
Sol. Based on NCERT 
 
Q.4.  Given below are two statements: 
 Statement I : Retardation factor (R
f
) can be measured in meter/centimeter 
 Statement II :R
f
 value of a compound remains constant in all solvents. 
 Choose the most appropriate answer from the options given below : 
(1) Statement I is false but statement II is true    
(2) Both statement I and statement II are false   
(3) Both statement I and statement II are true    
(4) Statement I is true but statement II is false 
Ans. (2) 
Sol. R
f
 (Retardation factor is dimension less) 
 
Q.5.  Mesityl oxide is a common name of : 
(1) 3-Methyl cyclohexane carbaldehyde   
(2) 4-Methyl pent-3-en-2-one   
(3) 2,4-Dimethyl pentan-3-one     
(4) 2-Methyl cyclohexanone 
 
 
 
 
 
Page 3


 
 
17
th
 March. 2021 | Shift 1 
SECTION - A 
 
Q.1.  The INCORRECT statement(s) about heavy water is (are) 
(A) Used as moderator in nuclear reactor 
(B) Obtained as a by-product in fertilizer industry 
(C) used for the study of reaction mechanism 
(D) has a higher dielectric constant than water 
Choose the correct answer from the option given below: 
(1) (B) only   
(2) (B) and (D) only   
(3) (C) only   
(4) (D) only  
Ans. (4) 
Sol. D
2
O = 78.06 (Dielectric constant) 
 H
2
O = 78.39 (Dielectric constant) 
 
Q.2.  Given below are two statements: 
Statement I : Potassium permanganate on heating at 573 K forms 
potassium manganate. 
Statement II :Both potassium permanganate and potassium manganate are 
tetrahedral and paramagnetic in nature. 
In the light of the above statements, choose the most appropriate answer 
from the options given below: 
(1) Both statement I and statement II are true    
(2)Both statement I and statement II are false   
(3)statement I is true but and statement II isfalse    
(4)statement I is false but statement II is true 
Ans. (3) 
Sol. 
7
4
KMnO
?
 
573K
? ? ? ? ?
6
2 4
K MnO
?
+ MnO
2
 + O
2 
 Dimagnetic       Potassium  
       Manganate one  
      unpaired electron  
      (Paramagnetic) 
 
4
2 4
KMnO
K MnO
?
?
? ? ? ?
?
?
Both one tetrahedral  
 
 
 
 
 
 
 
 
 
 
 
Q.3.  Which of the following is correct structure of tyrosine? 
(1)
 
COOH 
H H
2
N 
OH 
(2)
 
 
COOH 
H H
2
N 
OH 
   
(3)
 
COOH 
H H
2
N 
OH 
  (4) 
 
COOH 
H H
2
N 
OH 
 
Ans. (3) 
Sol. Based on NCERT 
 
Q.4.  Given below are two statements: 
 Statement I : Retardation factor (R
f
) can be measured in meter/centimeter 
 Statement II :R
f
 value of a compound remains constant in all solvents. 
 Choose the most appropriate answer from the options given below : 
(1) Statement I is false but statement II is true    
(2) Both statement I and statement II are false   
(3) Both statement I and statement II are true    
(4) Statement I is true but statement II is false 
Ans. (2) 
Sol. R
f
 (Retardation factor is dimension less) 
 
Q.5.  Mesityl oxide is a common name of : 
(1) 3-Methyl cyclohexane carbaldehyde   
(2) 4-Methyl pent-3-en-2-one   
(3) 2,4-Dimethyl pentan-3-one     
(4) 2-Methyl cyclohexanone 
 
 
 
 
 
 
 
17
th
 March. 2021 | Shift 1 
Ans. (2) 
Sol. 
 
 
CH
3
 
5 
CH 
CH
3
 
CH 
3 
C 
O 
CH
3
 
1 
(Mesityl oxide) 
2 
4-methyl pent-3-en-2-one 
4 
 
 
Q.6.  What is the spin-only magnetic moment value (BM) of a divalent metal ion 
with atomic number 25, in it’s aqueous solution ? 
(1) 5.92  (2) 5.26  (3) zero  (4) 5.0 
Ans. (1) 
Sol. 
25
Mn — 1s
2
 2s
2
 2p
6
 3s
2
 3p
6
 4s
2
 3d
5
 
 n = 5 
 spin – only magnetic moment = n(n 2) BM ? 
      = 5(5 2) 35 5.92BM ? ? ? 
 
Q.7.  A central atom in a molecule has two lone pairs of electrons and forms three 
single bonds. The shape of this molecule is : 
(1)trigonal pyramidal    (2) T-shaped   
(3) see-saw     (4) planar triangular 
 
Ans. (2) 
Sol. 2 L.P + 3 B.P = 5 VSEP (sp
3
d) 
 T-Shape 
 
 
 
 
 
 
 
 
 
 
 
Page 4


 
 
17
th
 March. 2021 | Shift 1 
SECTION - A 
 
Q.1.  The INCORRECT statement(s) about heavy water is (are) 
(A) Used as moderator in nuclear reactor 
(B) Obtained as a by-product in fertilizer industry 
(C) used for the study of reaction mechanism 
(D) has a higher dielectric constant than water 
Choose the correct answer from the option given below: 
(1) (B) only   
(2) (B) and (D) only   
(3) (C) only   
(4) (D) only  
Ans. (4) 
Sol. D
2
O = 78.06 (Dielectric constant) 
 H
2
O = 78.39 (Dielectric constant) 
 
Q.2.  Given below are two statements: 
Statement I : Potassium permanganate on heating at 573 K forms 
potassium manganate. 
Statement II :Both potassium permanganate and potassium manganate are 
tetrahedral and paramagnetic in nature. 
In the light of the above statements, choose the most appropriate answer 
from the options given below: 
(1) Both statement I and statement II are true    
(2)Both statement I and statement II are false   
(3)statement I is true but and statement II isfalse    
(4)statement I is false but statement II is true 
Ans. (3) 
Sol. 
7
4
KMnO
?
 
573K
? ? ? ? ?
6
2 4
K MnO
?
+ MnO
2
 + O
2 
 Dimagnetic       Potassium  
       Manganate one  
      unpaired electron  
      (Paramagnetic) 
 
4
2 4
KMnO
K MnO
?
?
? ? ? ?
?
?
Both one tetrahedral  
 
 
 
 
 
 
 
 
 
 
 
Q.3.  Which of the following is correct structure of tyrosine? 
(1)
 
COOH 
H H
2
N 
OH 
(2)
 
 
COOH 
H H
2
N 
OH 
   
(3)
 
COOH 
H H
2
N 
OH 
  (4) 
 
COOH 
H H
2
N 
OH 
 
Ans. (3) 
Sol. Based on NCERT 
 
Q.4.  Given below are two statements: 
 Statement I : Retardation factor (R
f
) can be measured in meter/centimeter 
 Statement II :R
f
 value of a compound remains constant in all solvents. 
 Choose the most appropriate answer from the options given below : 
(1) Statement I is false but statement II is true    
(2) Both statement I and statement II are false   
(3) Both statement I and statement II are true    
(4) Statement I is true but statement II is false 
Ans. (2) 
Sol. R
f
 (Retardation factor is dimension less) 
 
Q.5.  Mesityl oxide is a common name of : 
(1) 3-Methyl cyclohexane carbaldehyde   
(2) 4-Methyl pent-3-en-2-one   
(3) 2,4-Dimethyl pentan-3-one     
(4) 2-Methyl cyclohexanone 
 
 
 
 
 
 
 
17
th
 March. 2021 | Shift 1 
Ans. (2) 
Sol. 
 
 
CH
3
 
5 
CH 
CH
3
 
CH 
3 
C 
O 
CH
3
 
1 
(Mesityl oxide) 
2 
4-methyl pent-3-en-2-one 
4 
 
 
Q.6.  What is the spin-only magnetic moment value (BM) of a divalent metal ion 
with atomic number 25, in it’s aqueous solution ? 
(1) 5.92  (2) 5.26  (3) zero  (4) 5.0 
Ans. (1) 
Sol. 
25
Mn — 1s
2
 2s
2
 2p
6
 3s
2
 3p
6
 4s
2
 3d
5
 
 n = 5 
 spin – only magnetic moment = n(n 2) BM ? 
      = 5(5 2) 35 5.92BM ? ? ? 
 
Q.7.  A central atom in a molecule has two lone pairs of electrons and forms three 
single bonds. The shape of this molecule is : 
(1)trigonal pyramidal    (2) T-shaped   
(3) see-saw     (4) planar triangular 
 
Ans. (2) 
Sol. 2 L.P + 3 B.P = 5 VSEP (sp
3
d) 
 T-Shape 
 
 
 
 
 
 
 
 
 
 
 
 
 
Q.8.  
 
HBr 
CH
3 
CCl
4 
A 
(Major Product)
 
Product “A” in the above chemical reaction is : 
(1)
 
CH
3 
Br 
   (2)
 
CH
3 
Br 
CH
3 
 
  
(3) 
 
CH
3 
Br 
CH
3 
   (4) 
 
CH
3 
Br 
CH
3 
 
Ans. (2) 
 
Sol. 
 
 
CH=CH
2
 
CH
3
 
H
+
 
CH–CH
2
 
CH
3
 
+
H 
1,2-methyl 
CH–CH
3
 
CH
3
 
+
Br
–
 
CH 
Br 
CH
3
 
CH
3
 
shifting 
 
 
 
 
 
Page 5


 
 
17
th
 March. 2021 | Shift 1 
SECTION - A 
 
Q.1.  The INCORRECT statement(s) about heavy water is (are) 
(A) Used as moderator in nuclear reactor 
(B) Obtained as a by-product in fertilizer industry 
(C) used for the study of reaction mechanism 
(D) has a higher dielectric constant than water 
Choose the correct answer from the option given below: 
(1) (B) only   
(2) (B) and (D) only   
(3) (C) only   
(4) (D) only  
Ans. (4) 
Sol. D
2
O = 78.06 (Dielectric constant) 
 H
2
O = 78.39 (Dielectric constant) 
 
Q.2.  Given below are two statements: 
Statement I : Potassium permanganate on heating at 573 K forms 
potassium manganate. 
Statement II :Both potassium permanganate and potassium manganate are 
tetrahedral and paramagnetic in nature. 
In the light of the above statements, choose the most appropriate answer 
from the options given below: 
(1) Both statement I and statement II are true    
(2)Both statement I and statement II are false   
(3)statement I is true but and statement II isfalse    
(4)statement I is false but statement II is true 
Ans. (3) 
Sol. 
7
4
KMnO
?
 
573K
? ? ? ? ?
6
2 4
K MnO
?
+ MnO
2
 + O
2 
 Dimagnetic       Potassium  
       Manganate one  
      unpaired electron  
      (Paramagnetic) 
 
4
2 4
KMnO
K MnO
?
?
? ? ? ?
?
?
Both one tetrahedral  
 
 
 
 
 
 
 
 
 
 
 
Q.3.  Which of the following is correct structure of tyrosine? 
(1)
 
COOH 
H H
2
N 
OH 
(2)
 
 
COOH 
H H
2
N 
OH 
   
(3)
 
COOH 
H H
2
N 
OH 
  (4) 
 
COOH 
H H
2
N 
OH 
 
Ans. (3) 
Sol. Based on NCERT 
 
Q.4.  Given below are two statements: 
 Statement I : Retardation factor (R
f
) can be measured in meter/centimeter 
 Statement II :R
f
 value of a compound remains constant in all solvents. 
 Choose the most appropriate answer from the options given below : 
(1) Statement I is false but statement II is true    
(2) Both statement I and statement II are false   
(3) Both statement I and statement II are true    
(4) Statement I is true but statement II is false 
Ans. (2) 
Sol. R
f
 (Retardation factor is dimension less) 
 
Q.5.  Mesityl oxide is a common name of : 
(1) 3-Methyl cyclohexane carbaldehyde   
(2) 4-Methyl pent-3-en-2-one   
(3) 2,4-Dimethyl pentan-3-one     
(4) 2-Methyl cyclohexanone 
 
 
 
 
 
 
 
17
th
 March. 2021 | Shift 1 
Ans. (2) 
Sol. 
 
 
CH
3
 
5 
CH 
CH
3
 
CH 
3 
C 
O 
CH
3
 
1 
(Mesityl oxide) 
2 
4-methyl pent-3-en-2-one 
4 
 
 
Q.6.  What is the spin-only magnetic moment value (BM) of a divalent metal ion 
with atomic number 25, in it’s aqueous solution ? 
(1) 5.92  (2) 5.26  (3) zero  (4) 5.0 
Ans. (1) 
Sol. 
25
Mn — 1s
2
 2s
2
 2p
6
 3s
2
 3p
6
 4s
2
 3d
5
 
 n = 5 
 spin – only magnetic moment = n(n 2) BM ? 
      = 5(5 2) 35 5.92BM ? ? ? 
 
Q.7.  A central atom in a molecule has two lone pairs of electrons and forms three 
single bonds. The shape of this molecule is : 
(1)trigonal pyramidal    (2) T-shaped   
(3) see-saw     (4) planar triangular 
 
Ans. (2) 
Sol. 2 L.P + 3 B.P = 5 VSEP (sp
3
d) 
 T-Shape 
 
 
 
 
 
 
 
 
 
 
 
 
 
Q.8.  
 
HBr 
CH
3 
CCl
4 
A 
(Major Product)
 
Product “A” in the above chemical reaction is : 
(1)
 
CH
3 
Br 
   (2)
 
CH
3 
Br 
CH
3 
 
  
(3) 
 
CH
3 
Br 
CH
3 
   (4) 
 
CH
3 
Br 
CH
3 
 
Ans. (2) 
 
Sol. 
 
 
CH=CH
2
 
CH
3
 
H
+
 
CH–CH
2
 
CH
3
 
+
H 
1,2-methyl 
CH–CH
3
 
CH
3
 
+
Br
–
 
CH 
Br 
CH
3
 
CH
3
 
shifting 
 
 
 
 
 
 
 
17
th
 March. 2021 | Shift 1 
Q.9.  The point of intersection and sudden increase in the slop, in the diagram 
given below respectively, indicates : 
  
(1) ?G = 0 and melting or boiling point of the metal oxide  
 (2) ?G < 0 and decomposition of the metal oxide   
(3) ?G = 0 and reduction of the metal oxide    
(4) ?G > 0 and decomposition of the metal oxide 
 
Ans. (1) 
Sol. At the point of intersection ?G = 0 for involved reaction. ?
 
Q.10.  
 
+ NaOH
 
Cl O
–
Na
+ 
 
The above reaction requires which of the following reaction conditions? 
(1) 623 K, 300 atm   (2) 573 K, 300 atm   
(3) 573 K, Cu, 300 atm  (4) 623 K, Cu 300 atm 
 
Ans. (1) 
Sol. Based on NCERT 
 
Q.11.  The correct order of conductivity of ions in water is: 
(1) Cs
+
>Rb
+
> K
+
> Na
+
  (2) K
+
> Na
+
> Cs
+
>Rb
+
   
(3)Rb
+
> Na
+
> K
+
>Li
+
  (4) Na
+
> K
+
>Rb
+
> Cs
+ 
Ans. (1) 
Sol. 
aq
Cs
?
has lower hydrated radius so its electrical conductivity is higher. 
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