JEE Main 2020 Chemistry September 4 Shift 1 Paper & Solutions | Mock Tests for JEE Main and Advanced 2025 PDF Download

 Page 1


JEE Main 2020 Paper
         4
th
 September 2020 | (Shift-1), Chemistry     Page | 1
Date : 4
th
 September 2020
Time : 09 : 00 am - 12 : 00 pm
Subject : Chemistry
1. The IUPAC name of the following compound is :
CH
3
Br
C–OH
O
(1) 3-Bromo-5-methylcyclopentane carboxylic acid
(2) 4-Bromo-2-methylcyclopentane carboxylic acid
(3) 5-Bromo-3-methylcyclopentanoic acid
(4) 3-Bromo-5-methylcyclopentanoic acid
Sol. 2
CH
3
COOH
1
2
3
4 5
Br
4–Bromo-2-methylcyclopentane carboxylic acid
2. On heating, lead(II) nitrate gives a brown gas (A). The gas (A) on cooling changes to a
colourless solid/liquid (B). (B) on heating with NO changes to a blue solid (C). The
oxidation number of nitrogen in solid (C) is :
(1) +3 (2) +4 (3) +2 (4) +5
Sol. 1
Pb(NO
3
)
2
 ? PbO + NO
2
 + O
2
        (A)
    Brown gas
2NO
2
cooling
? ? ? ? ?
 N
2
O
4
    (C)
colourless solid
NO
2
 + NO ? 
2 3
N O
(C)
 + 
3
2 3
N O
?
blue solid
3. The ionic radii of O
2–
, F
–
, Na
+
 and Mg
2+
 are in the order :
(1) F
–
 > O
2–
 > Na
+
 > Mg
2+
(2) Mg
2+
 > Na
+
 > F
–
 > O
2–
(3) O
2–
 > F
–
 > Na
+
 > Mg
2+
(4) O
2–
 > F
–
 > Mg
2+
 > Na
+
Page 2


JEE Main 2020 Paper
         4
th
 September 2020 | (Shift-1), Chemistry     Page | 1
Date : 4
th
 September 2020
Time : 09 : 00 am - 12 : 00 pm
Subject : Chemistry
1. The IUPAC name of the following compound is :
CH
3
Br
C–OH
O
(1) 3-Bromo-5-methylcyclopentane carboxylic acid
(2) 4-Bromo-2-methylcyclopentane carboxylic acid
(3) 5-Bromo-3-methylcyclopentanoic acid
(4) 3-Bromo-5-methylcyclopentanoic acid
Sol. 2
CH
3
COOH
1
2
3
4 5
Br
4–Bromo-2-methylcyclopentane carboxylic acid
2. On heating, lead(II) nitrate gives a brown gas (A). The gas (A) on cooling changes to a
colourless solid/liquid (B). (B) on heating with NO changes to a blue solid (C). The
oxidation number of nitrogen in solid (C) is :
(1) +3 (2) +4 (3) +2 (4) +5
Sol. 1
Pb(NO
3
)
2
 ? PbO + NO
2
 + O
2
        (A)
    Brown gas
2NO
2
cooling
? ? ? ? ?
 N
2
O
4
    (C)
colourless solid
NO
2
 + NO ? 
2 3
N O
(C)
 + 
3
2 3
N O
?
blue solid
3. The ionic radii of O
2–
, F
–
, Na
+
 and Mg
2+
 are in the order :
(1) F
–
 > O
2–
 > Na
+
 > Mg
2+
(2) Mg
2+
 > Na
+
 > F
–
 > O
2–
(3) O
2–
 > F
–
 > Na
+
 > Mg
2+
(4) O
2–
 > F
–
 > Mg
2+
 > Na
+
JEE Main 2020 Paper
         4
th
 September 2020 | (Shift-1), Chemistry     Page | 2
Sol. 3
O
2–
 > F
–
 > Na
?
? ? ?Mg
2+
Ans. option (3)
4. When neopentyl alcohol is heated with an acid, it slowly converted into an 85 : 15
mixture of alkenes A and B, respectively. What are these alkenes ?
(1) 
CH
2
CH
3
CH
3
 and  
CH
2 CH
3
CH
3
(2) 
CH
3
H C
3
H C
3
 and  
CH
2
H C
3
H C
3
(3) 
CH
3
H C
3
H C
3
 and 
CH
2
CH
3
CH
3
(4) 
CH
2
H C
3
H C
3
 and 
CH
3
H C
3
CH
2
Sol. 3
OH
H
+
me-shifting
(85%)
(15%)
5. The region in the electromagnetic spectrum where the Balmer series lines appear is :
(1) Microwave (2) Infrared (3) Ultraviolet (4) Visible
Sol. 4
Question should be Bonous
As lines of Balamer series belongs to both UV as well visible region of EM spectrum.
However most appropriate should be visible region
Ans. (4)
Page 3


JEE Main 2020 Paper
         4
th
 September 2020 | (Shift-1), Chemistry     Page | 1
Date : 4
th
 September 2020
Time : 09 : 00 am - 12 : 00 pm
Subject : Chemistry
1. The IUPAC name of the following compound is :
CH
3
Br
C–OH
O
(1) 3-Bromo-5-methylcyclopentane carboxylic acid
(2) 4-Bromo-2-methylcyclopentane carboxylic acid
(3) 5-Bromo-3-methylcyclopentanoic acid
(4) 3-Bromo-5-methylcyclopentanoic acid
Sol. 2
CH
3
COOH
1
2
3
4 5
Br
4–Bromo-2-methylcyclopentane carboxylic acid
2. On heating, lead(II) nitrate gives a brown gas (A). The gas (A) on cooling changes to a
colourless solid/liquid (B). (B) on heating with NO changes to a blue solid (C). The
oxidation number of nitrogen in solid (C) is :
(1) +3 (2) +4 (3) +2 (4) +5
Sol. 1
Pb(NO
3
)
2
 ? PbO + NO
2
 + O
2
        (A)
    Brown gas
2NO
2
cooling
? ? ? ? ?
 N
2
O
4
    (C)
colourless solid
NO
2
 + NO ? 
2 3
N O
(C)
 + 
3
2 3
N O
?
blue solid
3. The ionic radii of O
2–
, F
–
, Na
+
 and Mg
2+
 are in the order :
(1) F
–
 > O
2–
 > Na
+
 > Mg
2+
(2) Mg
2+
 > Na
+
 > F
–
 > O
2–
(3) O
2–
 > F
–
 > Na
+
 > Mg
2+
(4) O
2–
 > F
–
 > Mg
2+
 > Na
+
JEE Main 2020 Paper
         4
th
 September 2020 | (Shift-1), Chemistry     Page | 2
Sol. 3
O
2–
 > F
–
 > Na
?
? ? ?Mg
2+
Ans. option (3)
4. When neopentyl alcohol is heated with an acid, it slowly converted into an 85 : 15
mixture of alkenes A and B, respectively. What are these alkenes ?
(1) 
CH
2
CH
3
CH
3
 and  
CH
2 CH
3
CH
3
(2) 
CH
3
H C
3
H C
3
 and  
CH
2
H C
3
H C
3
(3) 
CH
3
H C
3
H C
3
 and 
CH
2
CH
3
CH
3
(4) 
CH
2
H C
3
H C
3
 and 
CH
3
H C
3
CH
2
Sol. 3
OH
H
+
me-shifting
(85%)
(15%)
5. The region in the electromagnetic spectrum where the Balmer series lines appear is :
(1) Microwave (2) Infrared (3) Ultraviolet (4) Visible
Sol. 4
Question should be Bonous
As lines of Balamer series belongs to both UV as well visible region of EM spectrum.
However most appropriate should be visible region
Ans. (4)
JEE Main 2020 Paper
         4
th
 September 2020 | (Shift-1), Chemistry     Page | 3
6.
Salt
Bridge
E
ext
Cu rod
+ve
1M
CuSO
soln.
4
Zn rod
–ve
1M
ZnSO
soln.
4
2
0 34
º
Cu |Cu
E . V
?
? ?
2
0 76
º
Zn |Zn
E – . V
?
?
Identify the incorrect statement form the options below for the above cell :
(1) If E
ext
 = 1.1 V, no flow of e
–
 or current occurs
(2) If E
ext
 > 1.1 V, Zn dissolves at Zn electrode and Cu deposits at Cu electrode
(3) If E
ext
 > 1.1 V, e
–
 flows from Cu to Zn
(4) If E
ext
 < 1.1 V, Zn dissolves at anode and Cu doposits at cathode
Sol. 2
Direction NCERT Text theoritical questions
Ans. (2)
7. What are the functional groups present in the structure of maltose ?
(1) One acetal and one hemiacetal (2) One acetal and one ketal
(3) One ketal and one hemiketal (4) Two acetals
Sol. 1
CH OH
2
CH OH
2
H H
OH
H H
OH OH H H
H H OH OH
H H
OH
O O
Acetal
Meltose
O
Hemiacetal
8. Match the following :
(i) Foam (a) smoke
(ii) Gel (b) cell fluid
(iii) Aerosol (c) jellies
(iv) Emulsion (d) rubber
(e) froth
(f) milk
Page 4


JEE Main 2020 Paper
         4
th
 September 2020 | (Shift-1), Chemistry     Page | 1
Date : 4
th
 September 2020
Time : 09 : 00 am - 12 : 00 pm
Subject : Chemistry
1. The IUPAC name of the following compound is :
CH
3
Br
C–OH
O
(1) 3-Bromo-5-methylcyclopentane carboxylic acid
(2) 4-Bromo-2-methylcyclopentane carboxylic acid
(3) 5-Bromo-3-methylcyclopentanoic acid
(4) 3-Bromo-5-methylcyclopentanoic acid
Sol. 2
CH
3
COOH
1
2
3
4 5
Br
4–Bromo-2-methylcyclopentane carboxylic acid
2. On heating, lead(II) nitrate gives a brown gas (A). The gas (A) on cooling changes to a
colourless solid/liquid (B). (B) on heating with NO changes to a blue solid (C). The
oxidation number of nitrogen in solid (C) is :
(1) +3 (2) +4 (3) +2 (4) +5
Sol. 1
Pb(NO
3
)
2
 ? PbO + NO
2
 + O
2
        (A)
    Brown gas
2NO
2
cooling
? ? ? ? ?
 N
2
O
4
    (C)
colourless solid
NO
2
 + NO ? 
2 3
N O
(C)
 + 
3
2 3
N O
?
blue solid
3. The ionic radii of O
2–
, F
–
, Na
+
 and Mg
2+
 are in the order :
(1) F
–
 > O
2–
 > Na
+
 > Mg
2+
(2) Mg
2+
 > Na
+
 > F
–
 > O
2–
(3) O
2–
 > F
–
 > Na
+
 > Mg
2+
(4) O
2–
 > F
–
 > Mg
2+
 > Na
+
JEE Main 2020 Paper
         4
th
 September 2020 | (Shift-1), Chemistry     Page | 2
Sol. 3
O
2–
 > F
–
 > Na
?
? ? ?Mg
2+
Ans. option (3)
4. When neopentyl alcohol is heated with an acid, it slowly converted into an 85 : 15
mixture of alkenes A and B, respectively. What are these alkenes ?
(1) 
CH
2
CH
3
CH
3
 and  
CH
2 CH
3
CH
3
(2) 
CH
3
H C
3
H C
3
 and  
CH
2
H C
3
H C
3
(3) 
CH
3
H C
3
H C
3
 and 
CH
2
CH
3
CH
3
(4) 
CH
2
H C
3
H C
3
 and 
CH
3
H C
3
CH
2
Sol. 3
OH
H
+
me-shifting
(85%)
(15%)
5. The region in the electromagnetic spectrum where the Balmer series lines appear is :
(1) Microwave (2) Infrared (3) Ultraviolet (4) Visible
Sol. 4
Question should be Bonous
As lines of Balamer series belongs to both UV as well visible region of EM spectrum.
However most appropriate should be visible region
Ans. (4)
JEE Main 2020 Paper
         4
th
 September 2020 | (Shift-1), Chemistry     Page | 3
6.
Salt
Bridge
E
ext
Cu rod
+ve
1M
CuSO
soln.
4
Zn rod
–ve
1M
ZnSO
soln.
4
2
0 34
º
Cu |Cu
E . V
?
? ?
2
0 76
º
Zn |Zn
E – . V
?
?
Identify the incorrect statement form the options below for the above cell :
(1) If E
ext
 = 1.1 V, no flow of e
–
 or current occurs
(2) If E
ext
 > 1.1 V, Zn dissolves at Zn electrode and Cu deposits at Cu electrode
(3) If E
ext
 > 1.1 V, e
–
 flows from Cu to Zn
(4) If E
ext
 < 1.1 V, Zn dissolves at anode and Cu doposits at cathode
Sol. 2
Direction NCERT Text theoritical questions
Ans. (2)
7. What are the functional groups present in the structure of maltose ?
(1) One acetal and one hemiacetal (2) One acetal and one ketal
(3) One ketal and one hemiketal (4) Two acetals
Sol. 1
CH OH
2
CH OH
2
H H
OH
H H
OH OH H H
H H OH OH
H H
OH
O O
Acetal
Meltose
O
Hemiacetal
8. Match the following :
(i) Foam (a) smoke
(ii) Gel (b) cell fluid
(iii) Aerosol (c) jellies
(iv) Emulsion (d) rubber
(e) froth
(f) milk
JEE Main 2020 Paper
         4
th
 September 2020 | (Shift-1), Chemistry     Page | 4
(1) (i)-(e), (ii)-(c), (iii)-(a), (iv)-(f) (2) (i)-(b), (ii)-(c), (iii)-(e), (iv)-(d)
(3) (i)-(d), (ii)-(b), (iii)-(a), (iv)-(e) (4) (i)-(d), (ii)-(b), (iii)-(e), (iv)-(f)
Sol. 1
Foam ? Froth, whipped cream, soaplather
Gel ? Cheese, butter, jellies
Aerosol ? smoke dust
Emulsion ? milk
Sol ? Cell fluid
rubber ? Solid fom
froth ? form
(i) - e, (ii) - c, (iii) - a, (iv) - f
Ans. 1
9. An organic compound (A) (molecular formula C
6
H
12
O
2
) was hydrolysed with dil. H
2
SO
4
to give a carboxylic acid (B) and an alcohol (C). ‘C’ gives white turbidity immediately
when treated with anhydrous ZnCl
2
 and conc. HCl. The organic compound (A) is :
(1) 
O
O
(2) 
O
O
(3) 
O
O
(4) 
O
O
Sol. 4
O
O
O
OH
dil.H SO
2 4 +
OH
Cl
(B) (C)
ZnCl /HCl
2
(Immidiate white
turbidity)
10. Among the statements (a)-(d), the correct ones are :
(a) Lime stone is decomposed to CaO during the extraction of iron from its oxides.
(b) In the extraction of silver, silver is extracted as an anionic complex.
(c) Nickel is purified by Mond’s process.
(d) Zr and Ti are purified by Van Arkel method.
(1) (c) and (d) only (2) (b), (c) and (d) only
(3) (a), (b), (c) and (d) (4) (a), (c) and (d) only
Sol. 3
Lime stone finally goes to slag formation
CaCO
3
 ? CaO + CO
2
CaO + SiO
2
 ? CaSiO
3
slag
Page 5


JEE Main 2020 Paper
         4
th
 September 2020 | (Shift-1), Chemistry     Page | 1
Date : 4
th
 September 2020
Time : 09 : 00 am - 12 : 00 pm
Subject : Chemistry
1. The IUPAC name of the following compound is :
CH
3
Br
C–OH
O
(1) 3-Bromo-5-methylcyclopentane carboxylic acid
(2) 4-Bromo-2-methylcyclopentane carboxylic acid
(3) 5-Bromo-3-methylcyclopentanoic acid
(4) 3-Bromo-5-methylcyclopentanoic acid
Sol. 2
CH
3
COOH
1
2
3
4 5
Br
4–Bromo-2-methylcyclopentane carboxylic acid
2. On heating, lead(II) nitrate gives a brown gas (A). The gas (A) on cooling changes to a
colourless solid/liquid (B). (B) on heating with NO changes to a blue solid (C). The
oxidation number of nitrogen in solid (C) is :
(1) +3 (2) +4 (3) +2 (4) +5
Sol. 1
Pb(NO
3
)
2
 ? PbO + NO
2
 + O
2
        (A)
    Brown gas
2NO
2
cooling
? ? ? ? ?
 N
2
O
4
    (C)
colourless solid
NO
2
 + NO ? 
2 3
N O
(C)
 + 
3
2 3
N O
?
blue solid
3. The ionic radii of O
2–
, F
–
, Na
+
 and Mg
2+
 are in the order :
(1) F
–
 > O
2–
 > Na
+
 > Mg
2+
(2) Mg
2+
 > Na
+
 > F
–
 > O
2–
(3) O
2–
 > F
–
 > Na
+
 > Mg
2+
(4) O
2–
 > F
–
 > Mg
2+
 > Na
+
JEE Main 2020 Paper
         4
th
 September 2020 | (Shift-1), Chemistry     Page | 2
Sol. 3
O
2–
 > F
–
 > Na
?
? ? ?Mg
2+
Ans. option (3)
4. When neopentyl alcohol is heated with an acid, it slowly converted into an 85 : 15
mixture of alkenes A and B, respectively. What are these alkenes ?
(1) 
CH
2
CH
3
CH
3
 and  
CH
2 CH
3
CH
3
(2) 
CH
3
H C
3
H C
3
 and  
CH
2
H C
3
H C
3
(3) 
CH
3
H C
3
H C
3
 and 
CH
2
CH
3
CH
3
(4) 
CH
2
H C
3
H C
3
 and 
CH
3
H C
3
CH
2
Sol. 3
OH
H
+
me-shifting
(85%)
(15%)
5. The region in the electromagnetic spectrum where the Balmer series lines appear is :
(1) Microwave (2) Infrared (3) Ultraviolet (4) Visible
Sol. 4
Question should be Bonous
As lines of Balamer series belongs to both UV as well visible region of EM spectrum.
However most appropriate should be visible region
Ans. (4)
JEE Main 2020 Paper
         4
th
 September 2020 | (Shift-1), Chemistry     Page | 3
6.
Salt
Bridge
E
ext
Cu rod
+ve
1M
CuSO
soln.
4
Zn rod
–ve
1M
ZnSO
soln.
4
2
0 34
º
Cu |Cu
E . V
?
? ?
2
0 76
º
Zn |Zn
E – . V
?
?
Identify the incorrect statement form the options below for the above cell :
(1) If E
ext
 = 1.1 V, no flow of e
–
 or current occurs
(2) If E
ext
 > 1.1 V, Zn dissolves at Zn electrode and Cu deposits at Cu electrode
(3) If E
ext
 > 1.1 V, e
–
 flows from Cu to Zn
(4) If E
ext
 < 1.1 V, Zn dissolves at anode and Cu doposits at cathode
Sol. 2
Direction NCERT Text theoritical questions
Ans. (2)
7. What are the functional groups present in the structure of maltose ?
(1) One acetal and one hemiacetal (2) One acetal and one ketal
(3) One ketal and one hemiketal (4) Two acetals
Sol. 1
CH OH
2
CH OH
2
H H
OH
H H
OH OH H H
H H OH OH
H H
OH
O O
Acetal
Meltose
O
Hemiacetal
8. Match the following :
(i) Foam (a) smoke
(ii) Gel (b) cell fluid
(iii) Aerosol (c) jellies
(iv) Emulsion (d) rubber
(e) froth
(f) milk
JEE Main 2020 Paper
         4
th
 September 2020 | (Shift-1), Chemistry     Page | 4
(1) (i)-(e), (ii)-(c), (iii)-(a), (iv)-(f) (2) (i)-(b), (ii)-(c), (iii)-(e), (iv)-(d)
(3) (i)-(d), (ii)-(b), (iii)-(a), (iv)-(e) (4) (i)-(d), (ii)-(b), (iii)-(e), (iv)-(f)
Sol. 1
Foam ? Froth, whipped cream, soaplather
Gel ? Cheese, butter, jellies
Aerosol ? smoke dust
Emulsion ? milk
Sol ? Cell fluid
rubber ? Solid fom
froth ? form
(i) - e, (ii) - c, (iii) - a, (iv) - f
Ans. 1
9. An organic compound (A) (molecular formula C
6
H
12
O
2
) was hydrolysed with dil. H
2
SO
4
to give a carboxylic acid (B) and an alcohol (C). ‘C’ gives white turbidity immediately
when treated with anhydrous ZnCl
2
 and conc. HCl. The organic compound (A) is :
(1) 
O
O
(2) 
O
O
(3) 
O
O
(4) 
O
O
Sol. 4
O
O
O
OH
dil.H SO
2 4 +
OH
Cl
(B) (C)
ZnCl /HCl
2
(Immidiate white
turbidity)
10. Among the statements (a)-(d), the correct ones are :
(a) Lime stone is decomposed to CaO during the extraction of iron from its oxides.
(b) In the extraction of silver, silver is extracted as an anionic complex.
(c) Nickel is purified by Mond’s process.
(d) Zr and Ti are purified by Van Arkel method.
(1) (c) and (d) only (2) (b), (c) and (d) only
(3) (a), (b), (c) and (d) (4) (a), (c) and (d) only
Sol. 3
Lime stone finally goes to slag formation
CaCO
3
 ? CaO + CO
2
CaO + SiO
2
 ? CaSiO
3
slag
JEE Main 2020 Paper
         4
th
 September 2020 | (Shift-1), Chemistry     Page | 5
11. For one mole of an ideal gas, which of these statements must be true ?
(a) U and H each depends only on temperature
(b) Compressibility factor z is not equal to 1
(c) C
P, m
–C
V, m
=R
(d) dU=C
V
dT for any process
(1) (a), (c) and (d) (2) (a) and (c)
(3) (c) and (d) (4) (b), (c) and (d)
Sol. 1
For ideal gas
T T
v H
0 & 0
v v
? ?
? ?
? ?
(a) Hence function of temp. only.
(b) Compressibility factor (z) = 1 Always
(c) C
p,m
 – C
V,m
 = R
(d) dv = nC
v,m
 dT for all process
Ans. a,c,d
option (1)
12. [P] on treatment with Br
2
/FeBr
3
 in CCl
4
 produced a single isomer C
8
H
7
O
2
Br while heat-
ing [P] with sodalime gave toluene. The compound [P] is :
(1) 
CH COOH
2
(2) 
COOH
CH
3
(3) 
COOH
CH
3
(4) 
COOH
CH
3
Sol. 2
COOH
CH
3
COOH
CH
3
CH
3
Br /FeBr
2 3
Br
(Only comp.)