JEE MAIN - Chemistry (2020 - 4th September Morning Slot)
1
The IUPAC name of the following compound is :
Answer
(C)
4-Bromo-2-methylcyclopentane carboxylic
acid
2
The decreasing order of reactivity of the
following organic molecules towards AgNO3
solution is :
Answer
(A)
(B) > (A) > (C) > (D)
3
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) CP, m – CV, m = R
(d) dU = CVdT for any process
Answer
(A)
(a), (c) and (d)
4
The elements with atomic numbers 101 and 104
belong to, respectively :
Answer
(B)
Actinoids and Group 4
5
The pair in which both the species have the
same magnetic moment (spin only) is :
Answer
(D)
[Cr(H2O)6]2+ and [Fe(H2O)6]2+
6
The mass of ammonia in grams produced when
2.8 kg of dinitrogen quantitatively reacts with 1
kg of dihydrogen is _______.
Answer
3400
7
A 20.0 mL solution containing 0.2 g impure
H2O2 reacts completely with 0.316 g of KMnO4
in acid solution. The purity of H2O2 (in %) is
_____________
(mol. wt. of H2O2 = 34; mol. wt. of
KMnO4 = 158)
Answer
85
8
At 300 K, the vapour pressure of a solution
containing 1 mole of n-hexane and 3 moles of
n-heptane is 550 mm of Hg. At the same
temperature, if one more mole of n-heptane is
added to this solution, the vapour pressure of
the solution increases by 10 mm of Hg. What is
the vapour pressure in mm Hg of n-heptane in
its pure state ______?
Answer
600
9
If 75% of a first order reaction was completed
in 90 minutes, 60% of the same reaction would
be completed in approximately (in minutes)
_______.
(Take : log 2 = 0.30; log 2.5 = 0.40)
Answer
60
10
The number of chiral centres present in [B] is
_____.
Answer
4
11
$$E_{C{u^{2 + }}|Cu}^0$$ = +0.34 V
$$E_{Z{n^{2 + }}|Zn}^0$$ = -0.76 V
Identify the incorrect statement from the option
below for the above cell :
Answer
(D)
If Eext > 1.1 V, Zn dissolves at Zn electrode
and Cu deposits at Cu electrode
12
The intermolecular potential energy for the
molecules A, B, C and D given below suggests
that :
Answer
(A)
A-B has the stiffest bond
13
Which of the following will react with CHCl3 +
alc. KOH?
Answer
(C)
Adenine and lysine
14
The number of isomers possible for
[Pt(en)(NO2)2] is :
Answer
(A)
3
15
[P] on treatment with Br2/FeBr3 in CCl4
produced a single isomer C8H7O2Br while
heating [P] with sodalime gave toluene. The
compound [P] is
Answer
(C)
16
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?
Answer
(A)
17
The ionic radii of O2–, F–, Na+ and Mg2+ are in
the order :
Answer
(D)
O2– > F– > Na+ > Mg2+
18
The region in the electromagnetic spectrum
where the Balmar series lines appear is :
Answer
(C)
Visible
19
For the equilibrium A ⇌ B , the variation of the
rate of the forward (a) and reverse (b) reaction
with time is given by :
Answer
(C)
20
An organic compound (A) (molecular formula
C6H12O2) was hydrolysed with dil. H2SO4 to give
a carboxylic acid (B) and an alcohol (C). ‘C’
gives white turbidity immediately when treated
with anhydrous ZnCl2 and conc. HCl. The
organic compound (A) is :
Answer
(D)
21
What are the functional groups present in the
structure of maltose?
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