JEE Main 2020 Chemistry September 3 Shift 2 Paper & Solutions | Mock Tests for JEE Main and Advanced 2025 PDF Download

 Page 1


JEE Main 2020 Paper
         3
rd
 September 2020 | (Shift-2), Chemistry     Page | 1
Date : 3
rd
 September 2020
Time : 2 : 00 pm - 5 : 00 pm
Subject : Chemistry
1. The five successive ionization enthalpies of an element are 800, 2427, 3658, 25024
and 32824 kJ mol
–1
. The number of valence electrons in the element is:
(1) 2 (2) 4 (3) 3 (4) 5
Sol. 3
Fourth & Fifth I.E. are very high (periodic properties) indicating presence of three valence
shell electrons
2. The incorrect statement is:
(1) Manganate and permanganate ions are tetrahedral
(2) In manganate and permanganate ions, the ?-bonding takes place by overlap of p-
orbitals of oxygen and d-orbitals of manganese
(3) Manganate and permanganate ions are paramagnetic
(4) Manganate ion is green in colour and permanganate ion is purple in colour
Sol. 3
7
Mn
?
O
4
–
dº ? dimagnetic
6
Mn
?
O
4
2–
d
1
 ? Paramagnetic
3. Match the following drugs with their therapeutic actions:
(i) Ranitidine (a) Antidepressant
(ii) Nardil (Phenelzine) (b) Antibiotic
(iii)Chloramphenicol (c) Antihistamine
(iv) Dimetane (Brompheniramine) (d) Antacid
(e) Analgesic
(1) (i)-(d); (ii)-(a); (iii)-(b); (iv)-(c) (2) (i)-(d); (ii)-(c); (iii)-(a); (iv)-(e)
(3) (i)-(a); (ii)-(c); (iii)-(b); (iv)-(e) (4) (i)-(e); (ii)-(a); (iii)-(c); (iv)-(d)
Sol. 1
4. An ionic micelle is formed on the addition of:
(1) liquid diethyl ether to aqueous NaCl solution
(2) sodium stearate to pure toluene
(3) excess water to liquid 
(4) excess water to liquid
Sol. 3
ionic micelles formed by addition of water to soap {sodium stearate}
Ans. (3)
5. Among the statements (I–IV), the correct ones are:
(I) Be has smaller atomic radius compared to Mg.
(II)Be has higher ionization enthalpy than Al.
(III) Charge/radius ratio of Be is greater than that of Al.
(IV) Both Be and Al form mainly covalent compounds.
(1) (I), (II) and (IV) (2) (I), (II) and (III)
(3) (II), (III) and (IV) (4) (I), (III) and (IV)
Page 2


JEE Main 2020 Paper
         3
rd
 September 2020 | (Shift-2), Chemistry     Page | 1
Date : 3
rd
 September 2020
Time : 2 : 00 pm - 5 : 00 pm
Subject : Chemistry
1. The five successive ionization enthalpies of an element are 800, 2427, 3658, 25024
and 32824 kJ mol
–1
. The number of valence electrons in the element is:
(1) 2 (2) 4 (3) 3 (4) 5
Sol. 3
Fourth & Fifth I.E. are very high (periodic properties) indicating presence of three valence
shell electrons
2. The incorrect statement is:
(1) Manganate and permanganate ions are tetrahedral
(2) In manganate and permanganate ions, the ?-bonding takes place by overlap of p-
orbitals of oxygen and d-orbitals of manganese
(3) Manganate and permanganate ions are paramagnetic
(4) Manganate ion is green in colour and permanganate ion is purple in colour
Sol. 3
7
Mn
?
O
4
–
dº ? dimagnetic
6
Mn
?
O
4
2–
d
1
 ? Paramagnetic
3. Match the following drugs with their therapeutic actions:
(i) Ranitidine (a) Antidepressant
(ii) Nardil (Phenelzine) (b) Antibiotic
(iii)Chloramphenicol (c) Antihistamine
(iv) Dimetane (Brompheniramine) (d) Antacid
(e) Analgesic
(1) (i)-(d); (ii)-(a); (iii)-(b); (iv)-(c) (2) (i)-(d); (ii)-(c); (iii)-(a); (iv)-(e)
(3) (i)-(a); (ii)-(c); (iii)-(b); (iv)-(e) (4) (i)-(e); (ii)-(a); (iii)-(c); (iv)-(d)
Sol. 1
4. An ionic micelle is formed on the addition of:
(1) liquid diethyl ether to aqueous NaCl solution
(2) sodium stearate to pure toluene
(3) excess water to liquid 
(4) excess water to liquid
Sol. 3
ionic micelles formed by addition of water to soap {sodium stearate}
Ans. (3)
5. Among the statements (I–IV), the correct ones are:
(I) Be has smaller atomic radius compared to Mg.
(II)Be has higher ionization enthalpy than Al.
(III) Charge/radius ratio of Be is greater than that of Al.
(IV) Both Be and Al form mainly covalent compounds.
(1) (I), (II) and (IV) (2) (I), (II) and (III)
(3) (II), (III) and (IV) (4) (I), (III) and (IV)
JEE Main 2020 Paper
         3
rd
 September 2020 | (Shift-2), Chemistry     Page | 2
Sol. 1
Refer S-Block
6. Complex A has a composition of H
12
O
6
Cl
3
Cr . If the complex on treatment with conc.H
2
SO
4
loses 13.5% of its original mass, the correct molecular formula of A is:
[Given: atomic mass of Cr = 52 amu and Cl = 35 amu]
(1) [Cr(H
2
O)
5
Cl]Cl
2
.H
2
O (2) [Cr(H
2
O)
4
Cl
2
]Cl.2H
2
O
(3) [Cr(H
2
O)
3
Cl
3
].3H
2
O (4) [Cr(H
2
O)
6
]Cl
3
Sol. 2
Let x molecule of water are lost then
13.5 = 
x 18
6 18 3 35 52
? ? ?
? ?
? ? ? ?
? ?
 × 100
x = 1.99  2
so, complex is [Cr(H
2
O)
4
Cl
2
].2H
2
O
7. The decreasing order of reactivity of the following compounds towards nucleophilic
substitution (S
N
2) is:
CH Cl
2
(I)
CH Cl
2
(II)
NO
2
NO
2
 
CH Cl
2
(III)
NO
2
NO
2
CH Cl
2
(IV)
NO
2
O
2
N
(1) (III) > (II) > (IV) > (I) (2) (IV) > (II) > (III) > (I)
(3) (II) > (III) > (IV) > (I) (4) (II) > (III) > (I) > (IV)
Sol. 3
CH – Cl
2
CH – Cl
2
NO
2
(I) (II)
CH – Cl
2
NO
2
(III)
NO
2
NO
2
CH – Cl
2
NO
2
(IV)
NO
2
(–m)
(–m)
(–m)
(–m)
(–m)
(-m)
8. The increasing order of the reactivity of the following compounds in nucleophilic addition
reaction is:
Propanal, Benzaldehyde, Propanone, Butanone
(1) Benzaldehyde < Propanal < Propanone < Butanone
(2) Propanal < Propanone < Butanone < Benzaldehyde
(3) Butanone < Propanone < Benzaldehyde < Propanal
(4) Benzaldehyde < Butanone < Propanone < Propanal
Sol. 3
Rate of Nucleophilic addition ? Aldehyde > Ketone
Aliphatic aldehyde > Aromatic aldehyde
Page 3


JEE Main 2020 Paper
         3
rd
 September 2020 | (Shift-2), Chemistry     Page | 1
Date : 3
rd
 September 2020
Time : 2 : 00 pm - 5 : 00 pm
Subject : Chemistry
1. The five successive ionization enthalpies of an element are 800, 2427, 3658, 25024
and 32824 kJ mol
–1
. The number of valence electrons in the element is:
(1) 2 (2) 4 (3) 3 (4) 5
Sol. 3
Fourth & Fifth I.E. are very high (periodic properties) indicating presence of three valence
shell electrons
2. The incorrect statement is:
(1) Manganate and permanganate ions are tetrahedral
(2) In manganate and permanganate ions, the ?-bonding takes place by overlap of p-
orbitals of oxygen and d-orbitals of manganese
(3) Manganate and permanganate ions are paramagnetic
(4) Manganate ion is green in colour and permanganate ion is purple in colour
Sol. 3
7
Mn
?
O
4
–
dº ? dimagnetic
6
Mn
?
O
4
2–
d
1
 ? Paramagnetic
3. Match the following drugs with their therapeutic actions:
(i) Ranitidine (a) Antidepressant
(ii) Nardil (Phenelzine) (b) Antibiotic
(iii)Chloramphenicol (c) Antihistamine
(iv) Dimetane (Brompheniramine) (d) Antacid
(e) Analgesic
(1) (i)-(d); (ii)-(a); (iii)-(b); (iv)-(c) (2) (i)-(d); (ii)-(c); (iii)-(a); (iv)-(e)
(3) (i)-(a); (ii)-(c); (iii)-(b); (iv)-(e) (4) (i)-(e); (ii)-(a); (iii)-(c); (iv)-(d)
Sol. 1
4. An ionic micelle is formed on the addition of:
(1) liquid diethyl ether to aqueous NaCl solution
(2) sodium stearate to pure toluene
(3) excess water to liquid 
(4) excess water to liquid
Sol. 3
ionic micelles formed by addition of water to soap {sodium stearate}
Ans. (3)
5. Among the statements (I–IV), the correct ones are:
(I) Be has smaller atomic radius compared to Mg.
(II)Be has higher ionization enthalpy than Al.
(III) Charge/radius ratio of Be is greater than that of Al.
(IV) Both Be and Al form mainly covalent compounds.
(1) (I), (II) and (IV) (2) (I), (II) and (III)
(3) (II), (III) and (IV) (4) (I), (III) and (IV)
JEE Main 2020 Paper
         3
rd
 September 2020 | (Shift-2), Chemistry     Page | 2
Sol. 1
Refer S-Block
6. Complex A has a composition of H
12
O
6
Cl
3
Cr . If the complex on treatment with conc.H
2
SO
4
loses 13.5% of its original mass, the correct molecular formula of A is:
[Given: atomic mass of Cr = 52 amu and Cl = 35 amu]
(1) [Cr(H
2
O)
5
Cl]Cl
2
.H
2
O (2) [Cr(H
2
O)
4
Cl
2
]Cl.2H
2
O
(3) [Cr(H
2
O)
3
Cl
3
].3H
2
O (4) [Cr(H
2
O)
6
]Cl
3
Sol. 2
Let x molecule of water are lost then
13.5 = 
x 18
6 18 3 35 52
? ? ?
? ?
? ? ? ?
? ?
 × 100
x = 1.99  2
so, complex is [Cr(H
2
O)
4
Cl
2
].2H
2
O
7. The decreasing order of reactivity of the following compounds towards nucleophilic
substitution (S
N
2) is:
CH Cl
2
(I)
CH Cl
2
(II)
NO
2
NO
2
 
CH Cl
2
(III)
NO
2
NO
2
CH Cl
2
(IV)
NO
2
O
2
N
(1) (III) > (II) > (IV) > (I) (2) (IV) > (II) > (III) > (I)
(3) (II) > (III) > (IV) > (I) (4) (II) > (III) > (I) > (IV)
Sol. 3
CH – Cl
2
CH – Cl
2
NO
2
(I) (II)
CH – Cl
2
NO
2
(III)
NO
2
NO
2
CH – Cl
2
NO
2
(IV)
NO
2
(–m)
(–m)
(–m)
(–m)
(–m)
(-m)
8. The increasing order of the reactivity of the following compounds in nucleophilic addition
reaction is:
Propanal, Benzaldehyde, Propanone, Butanone
(1) Benzaldehyde < Propanal < Propanone < Butanone
(2) Propanal < Propanone < Butanone < Benzaldehyde
(3) Butanone < Propanone < Benzaldehyde < Propanal
(4) Benzaldehyde < Butanone < Propanone < Propanal
Sol. 3
Rate of Nucleophilic addition ? Aldehyde > Ketone
Aliphatic aldehyde > Aromatic aldehyde
JEE Main 2020 Paper
         3
rd
 September 2020 | (Shift-2), Chemistry     Page | 3
9. The major product in the following reaction is:
I
 
Heat
BuOH t
? ? ? ? ? ?
?
(1) 
Ot-Bu
(2) (3) (4) 
Sol. 3
10. The incorrect statement(s) among (a) – (d) regarding acid rain is (are):
(a) It can corrode water pipes.
(b) It can damage structures made up of stone.
(c) It cannot cause respiratory ailments in animals
(d) It is not harmful for trees
(1) (a), (b) and (d) (2) (a), (c) and (d) (3) (c) and (d) (4) (c) only
Sol. 3
Acid rain can cause respiratory ailments in animals and also harmful for trees and
plant.
11. 100 mL of 0.1 M HCl is taken in a beaker and to it 100 mL of 0.1 M NaOH is added in
steps of 2 mL and the pH is continuously measured. Which of the following graphs
correctly depicts the change in pH?
(1) 
pH
vol. of NaOH
7
(2) 
pH
vol. of NaOH
7
(3) 
pH
vol. of NaOH
7
(4) 
pH
vol. of NaOH
7
Page 4


JEE Main 2020 Paper
         3
rd
 September 2020 | (Shift-2), Chemistry     Page | 1
Date : 3
rd
 September 2020
Time : 2 : 00 pm - 5 : 00 pm
Subject : Chemistry
1. The five successive ionization enthalpies of an element are 800, 2427, 3658, 25024
and 32824 kJ mol
–1
. The number of valence electrons in the element is:
(1) 2 (2) 4 (3) 3 (4) 5
Sol. 3
Fourth & Fifth I.E. are very high (periodic properties) indicating presence of three valence
shell electrons
2. The incorrect statement is:
(1) Manganate and permanganate ions are tetrahedral
(2) In manganate and permanganate ions, the ?-bonding takes place by overlap of p-
orbitals of oxygen and d-orbitals of manganese
(3) Manganate and permanganate ions are paramagnetic
(4) Manganate ion is green in colour and permanganate ion is purple in colour
Sol. 3
7
Mn
?
O
4
–
dº ? dimagnetic
6
Mn
?
O
4
2–
d
1
 ? Paramagnetic
3. Match the following drugs with their therapeutic actions:
(i) Ranitidine (a) Antidepressant
(ii) Nardil (Phenelzine) (b) Antibiotic
(iii)Chloramphenicol (c) Antihistamine
(iv) Dimetane (Brompheniramine) (d) Antacid
(e) Analgesic
(1) (i)-(d); (ii)-(a); (iii)-(b); (iv)-(c) (2) (i)-(d); (ii)-(c); (iii)-(a); (iv)-(e)
(3) (i)-(a); (ii)-(c); (iii)-(b); (iv)-(e) (4) (i)-(e); (ii)-(a); (iii)-(c); (iv)-(d)
Sol. 1
4. An ionic micelle is formed on the addition of:
(1) liquid diethyl ether to aqueous NaCl solution
(2) sodium stearate to pure toluene
(3) excess water to liquid 
(4) excess water to liquid
Sol. 3
ionic micelles formed by addition of water to soap {sodium stearate}
Ans. (3)
5. Among the statements (I–IV), the correct ones are:
(I) Be has smaller atomic radius compared to Mg.
(II)Be has higher ionization enthalpy than Al.
(III) Charge/radius ratio of Be is greater than that of Al.
(IV) Both Be and Al form mainly covalent compounds.
(1) (I), (II) and (IV) (2) (I), (II) and (III)
(3) (II), (III) and (IV) (4) (I), (III) and (IV)
JEE Main 2020 Paper
         3
rd
 September 2020 | (Shift-2), Chemistry     Page | 2
Sol. 1
Refer S-Block
6. Complex A has a composition of H
12
O
6
Cl
3
Cr . If the complex on treatment with conc.H
2
SO
4
loses 13.5% of its original mass, the correct molecular formula of A is:
[Given: atomic mass of Cr = 52 amu and Cl = 35 amu]
(1) [Cr(H
2
O)
5
Cl]Cl
2
.H
2
O (2) [Cr(H
2
O)
4
Cl
2
]Cl.2H
2
O
(3) [Cr(H
2
O)
3
Cl
3
].3H
2
O (4) [Cr(H
2
O)
6
]Cl
3
Sol. 2
Let x molecule of water are lost then
13.5 = 
x 18
6 18 3 35 52
? ? ?
? ?
? ? ? ?
? ?
 × 100
x = 1.99  2
so, complex is [Cr(H
2
O)
4
Cl
2
].2H
2
O
7. The decreasing order of reactivity of the following compounds towards nucleophilic
substitution (S
N
2) is:
CH Cl
2
(I)
CH Cl
2
(II)
NO
2
NO
2
 
CH Cl
2
(III)
NO
2
NO
2
CH Cl
2
(IV)
NO
2
O
2
N
(1) (III) > (II) > (IV) > (I) (2) (IV) > (II) > (III) > (I)
(3) (II) > (III) > (IV) > (I) (4) (II) > (III) > (I) > (IV)
Sol. 3
CH – Cl
2
CH – Cl
2
NO
2
(I) (II)
CH – Cl
2
NO
2
(III)
NO
2
NO
2
CH – Cl
2
NO
2
(IV)
NO
2
(–m)
(–m)
(–m)
(–m)
(–m)
(-m)
8. The increasing order of the reactivity of the following compounds in nucleophilic addition
reaction is:
Propanal, Benzaldehyde, Propanone, Butanone
(1) Benzaldehyde < Propanal < Propanone < Butanone
(2) Propanal < Propanone < Butanone < Benzaldehyde
(3) Butanone < Propanone < Benzaldehyde < Propanal
(4) Benzaldehyde < Butanone < Propanone < Propanal
Sol. 3
Rate of Nucleophilic addition ? Aldehyde > Ketone
Aliphatic aldehyde > Aromatic aldehyde
JEE Main 2020 Paper
         3
rd
 September 2020 | (Shift-2), Chemistry     Page | 3
9. The major product in the following reaction is:
I
 
Heat
BuOH t
? ? ? ? ? ?
?
(1) 
Ot-Bu
(2) (3) (4) 
Sol. 3
10. The incorrect statement(s) among (a) – (d) regarding acid rain is (are):
(a) It can corrode water pipes.
(b) It can damage structures made up of stone.
(c) It cannot cause respiratory ailments in animals
(d) It is not harmful for trees
(1) (a), (b) and (d) (2) (a), (c) and (d) (3) (c) and (d) (4) (c) only
Sol. 3
Acid rain can cause respiratory ailments in animals and also harmful for trees and
plant.
11. 100 mL of 0.1 M HCl is taken in a beaker and to it 100 mL of 0.1 M NaOH is added in
steps of 2 mL and the pH is continuously measured. Which of the following graphs
correctly depicts the change in pH?
(1) 
pH
vol. of NaOH
7
(2) 
pH
vol. of NaOH
7
(3) 
pH
vol. of NaOH
7
(4) 
pH
vol. of NaOH
7
JEE Main 2020 Paper
         3
rd
 September 2020 | (Shift-2), Chemistry     Page | 4
Sol. 3
NaOH(2ml)
HCl
initially pH will be acidic < 7
at eq pH pH = 7
& finally pH will be basic > 7
vol of NaOH
7
pH
option (3)
12. Consider the hypothetical situation where the azimuthal quantum number, l, takes
values 0, 1, 2, ...... n + 1, where n is the principal quantum number. Then, the element
with atomic number:
(1) 13 has a half-filled valence subshell (2) 9 is the first alkali metal
(3) 8 is the first noble gas (4) 6 has a 2p-valence subshell
Sol. 1
(1)
13
X = 1s
2
 1p
6
 1d
5
  - half filled
(2)
9
X = 1s
2
 1p
6
 1d
1      
- not alkali metal
(3)
8
X = 1s
2
 1p
6          
 - Second nobel gas
Option (1)
13. The d-electron configuration of [Ru(en)
3
]Cl
2
 and [Fe(H
2
O)
6
]Cl
2
, respectively are:
(1) 
2
g
4
g 2
e t and 
0
g
6
g 2
e t (2) 
0
g
6
g 2
e t and 
0
g
6
g 2
e t
(3) 
2
g
4
g 2
e t and 
2
g
4
g 2
e t (4) 
0
g
6
g 2
e t and 
2
g
4
g 2
e t
Sol. 4
[Ru(en) ]Cl
3 2
[Fe(H O) ]Cl
2 6 2
2+ 2+
Low spin
complex
High spin
complex
d
6
d
6
 eg
0 
eg
2
t
2g
6
 t
2g
4
|
Page 5


JEE Main 2020 Paper
         3
rd
 September 2020 | (Shift-2), Chemistry     Page | 1
Date : 3
rd
 September 2020
Time : 2 : 00 pm - 5 : 00 pm
Subject : Chemistry
1. The five successive ionization enthalpies of an element are 800, 2427, 3658, 25024
and 32824 kJ mol
–1
. The number of valence electrons in the element is:
(1) 2 (2) 4 (3) 3 (4) 5
Sol. 3
Fourth & Fifth I.E. are very high (periodic properties) indicating presence of three valence
shell electrons
2. The incorrect statement is:
(1) Manganate and permanganate ions are tetrahedral
(2) In manganate and permanganate ions, the ?-bonding takes place by overlap of p-
orbitals of oxygen and d-orbitals of manganese
(3) Manganate and permanganate ions are paramagnetic
(4) Manganate ion is green in colour and permanganate ion is purple in colour
Sol. 3
7
Mn
?
O
4
–
dº ? dimagnetic
6
Mn
?
O
4
2–
d
1
 ? Paramagnetic
3. Match the following drugs with their therapeutic actions:
(i) Ranitidine (a) Antidepressant
(ii) Nardil (Phenelzine) (b) Antibiotic
(iii)Chloramphenicol (c) Antihistamine
(iv) Dimetane (Brompheniramine) (d) Antacid
(e) Analgesic
(1) (i)-(d); (ii)-(a); (iii)-(b); (iv)-(c) (2) (i)-(d); (ii)-(c); (iii)-(a); (iv)-(e)
(3) (i)-(a); (ii)-(c); (iii)-(b); (iv)-(e) (4) (i)-(e); (ii)-(a); (iii)-(c); (iv)-(d)
Sol. 1
4. An ionic micelle is formed on the addition of:
(1) liquid diethyl ether to aqueous NaCl solution
(2) sodium stearate to pure toluene
(3) excess water to liquid 
(4) excess water to liquid
Sol. 3
ionic micelles formed by addition of water to soap {sodium stearate}
Ans. (3)
5. Among the statements (I–IV), the correct ones are:
(I) Be has smaller atomic radius compared to Mg.
(II)Be has higher ionization enthalpy than Al.
(III) Charge/radius ratio of Be is greater than that of Al.
(IV) Both Be and Al form mainly covalent compounds.
(1) (I), (II) and (IV) (2) (I), (II) and (III)
(3) (II), (III) and (IV) (4) (I), (III) and (IV)
JEE Main 2020 Paper
         3
rd
 September 2020 | (Shift-2), Chemistry     Page | 2
Sol. 1
Refer S-Block
6. Complex A has a composition of H
12
O
6
Cl
3
Cr . If the complex on treatment with conc.H
2
SO
4
loses 13.5% of its original mass, the correct molecular formula of A is:
[Given: atomic mass of Cr = 52 amu and Cl = 35 amu]
(1) [Cr(H
2
O)
5
Cl]Cl
2
.H
2
O (2) [Cr(H
2
O)
4
Cl
2
]Cl.2H
2
O
(3) [Cr(H
2
O)
3
Cl
3
].3H
2
O (4) [Cr(H
2
O)
6
]Cl
3
Sol. 2
Let x molecule of water are lost then
13.5 = 
x 18
6 18 3 35 52
? ? ?
? ?
? ? ? ?
? ?
 × 100
x = 1.99  2
so, complex is [Cr(H
2
O)
4
Cl
2
].2H
2
O
7. The decreasing order of reactivity of the following compounds towards nucleophilic
substitution (S
N
2) is:
CH Cl
2
(I)
CH Cl
2
(II)
NO
2
NO
2
 
CH Cl
2
(III)
NO
2
NO
2
CH Cl
2
(IV)
NO
2
O
2
N
(1) (III) > (II) > (IV) > (I) (2) (IV) > (II) > (III) > (I)
(3) (II) > (III) > (IV) > (I) (4) (II) > (III) > (I) > (IV)
Sol. 3
CH – Cl
2
CH – Cl
2
NO
2
(I) (II)
CH – Cl
2
NO
2
(III)
NO
2
NO
2
CH – Cl
2
NO
2
(IV)
NO
2
(–m)
(–m)
(–m)
(–m)
(–m)
(-m)
8. The increasing order of the reactivity of the following compounds in nucleophilic addition
reaction is:
Propanal, Benzaldehyde, Propanone, Butanone
(1) Benzaldehyde < Propanal < Propanone < Butanone
(2) Propanal < Propanone < Butanone < Benzaldehyde
(3) Butanone < Propanone < Benzaldehyde < Propanal
(4) Benzaldehyde < Butanone < Propanone < Propanal
Sol. 3
Rate of Nucleophilic addition ? Aldehyde > Ketone
Aliphatic aldehyde > Aromatic aldehyde
JEE Main 2020 Paper
         3
rd
 September 2020 | (Shift-2), Chemistry     Page | 3
9. The major product in the following reaction is:
I
 
Heat
BuOH t
? ? ? ? ? ?
?
(1) 
Ot-Bu
(2) (3) (4) 
Sol. 3
10. The incorrect statement(s) among (a) – (d) regarding acid rain is (are):
(a) It can corrode water pipes.
(b) It can damage structures made up of stone.
(c) It cannot cause respiratory ailments in animals
(d) It is not harmful for trees
(1) (a), (b) and (d) (2) (a), (c) and (d) (3) (c) and (d) (4) (c) only
Sol. 3
Acid rain can cause respiratory ailments in animals and also harmful for trees and
plant.
11. 100 mL of 0.1 M HCl is taken in a beaker and to it 100 mL of 0.1 M NaOH is added in
steps of 2 mL and the pH is continuously measured. Which of the following graphs
correctly depicts the change in pH?
(1) 
pH
vol. of NaOH
7
(2) 
pH
vol. of NaOH
7
(3) 
pH
vol. of NaOH
7
(4) 
pH
vol. of NaOH
7
JEE Main 2020 Paper
         3
rd
 September 2020 | (Shift-2), Chemistry     Page | 4
Sol. 3
NaOH(2ml)
HCl
initially pH will be acidic < 7
at eq pH pH = 7
& finally pH will be basic > 7
vol of NaOH
7
pH
option (3)
12. Consider the hypothetical situation where the azimuthal quantum number, l, takes
values 0, 1, 2, ...... n + 1, where n is the principal quantum number. Then, the element
with atomic number:
(1) 13 has a half-filled valence subshell (2) 9 is the first alkali metal
(3) 8 is the first noble gas (4) 6 has a 2p-valence subshell
Sol. 1
(1)
13
X = 1s
2
 1p
6
 1d
5
  - half filled
(2)
9
X = 1s
2
 1p
6
 1d
1      
- not alkali metal
(3)
8
X = 1s
2
 1p
6          
 - Second nobel gas
Option (1)
13. The d-electron configuration of [Ru(en)
3
]Cl
2
 and [Fe(H
2
O)
6
]Cl
2
, respectively are:
(1) 
2
g
4
g 2
e t and 
0
g
6
g 2
e t (2) 
0
g
6
g 2
e t and 
0
g
6
g 2
e t
(3) 
2
g
4
g 2
e t and 
2
g
4
g 2
e t (4) 
0
g
6
g 2
e t and 
2
g
4
g 2
e t
Sol. 4
[Ru(en) ]Cl
3 2
[Fe(H O) ]Cl
2 6 2
2+ 2+
Low spin
complex
High spin
complex
d
6
d
6
 eg
0 
eg
2
t
2g
6
 t
2g
4
|
JEE Main 2020 Paper
         3
rd
 September 2020 | (Shift-2), Chemistry     Page | 5
14. Consider the following molecules and statements related to them:
(A) 
O
C 
H
O
H
O
(B) 
O
C 
H
O
O
H
(a) (B) is more likely to be crystalline than (A)
(b) (B) has higher boiling point than (A)
(c) (B) dissolves more readily than (A) in water
Identify the correct option from below:
(1) (a) and (c) are true (2) only (a) is true
(3) (b) and (c) are true (4) (a) and (b) are true
Sol. Bonus
All answer are correct
15. The strengths of 5.6 volume hydrogen peroxide (of density 1 g/mL) in terms of mass
percentage and molarity (M), respectively, are:
(Take molar mass of hydrogen peroxide as 34 g/mol)
(1) 0.85 and 0.5 (2) 0.85 and 0.25
(3) 1.7 and 0.25 (4) 1.7 and 0.5
Sol. 4
Volume strength = 5.6V
molarity = 
5.6
11.2
= 0.5 mol / l
mass % = 
0.5 34
10
? ? ?
? ?
? ?
×
1
1g /ml
= 1.7 %
Ans. 1.7 & 0.5 option (4)
16. The compound A in the following reactions is:
A 
?
? ? ? ? ? ? ? ? ?
/ SO H Conc. ) ii (
O H / MgBr CH ) i (
4 2
2 3
B 
O Zn/H ) ii (
O ) i (
2
3
? ? ? ? ? C + D
C 
?
? ? ? ? ? ? ? ?
 ) ii (
KOH Conc. ) i (
 COO  K
+
 + CH OH
2
D 
?
? ? ? ? ? ?
2
) OH ( Ba
 
H C–C=CH–C–CH
3 3
O CH
3
(1) C H —CH –C–CH
6 5 2 3
O
(2) 
C H –C–CH
6 5 3
O
(3) 
C H –C–CH
6 5
O
CH
3
CH
3
(4) 
C H –C–CH CH
6 5 2 3
O