JEE MAIN - Chemistry (2020 - 6th September Evening Slot)
1
The correct match between Item-I (starting
material) and Item-II (reagent) for the
preparation of benzaldehyde is :
Item-I
Item-II
(I) Benzene
(P) HCl and SnCl2,
H3O+
(II) Benzonitrile
(Q) H2, Pd-BaSO4, S
and quinoline
(III) Benzoyl Chloride
(R) CO, HCl and AlCl3
Answer
(A)
(I) - (R), (II) - (P) and (III) - (Q)
2
The average molar mass of chlorine is
35.5 g mol–1. The ratio of 35Cl to 37Cl in naturally
occuring chlorine is close to :
Answer
(C)
3 : 1
3
Mischmetal is an alloy consisting mainly of :
Answer
(C)
lanthanoid metals
4
Which of the following compounds can be
prepared in good yield by Gabriel phthalimide
synthesis?
Answer
(B)
5
For a reaction,
4M(s) + nO2(g) $$ \to $$ 2M2On(s)
the free energy change is plotted as a function
of temperature. The temperature below which
the oxide is stable could be inferred from the
plot as the point at which :
Answer
(A)
the free energy change shows a change
from negative to positive value
6
The IUPAC name of the following compound is :
Answer
(D)
5-amino-4-hydroxymethyl-2-nitro benzaldehyde
7
The rate of a reaction decreased by 3.555
times when the temperature was changed
from 40oC to 30oC. The activation energy
(in kJ mol–1) of the reaction is _______.
Take;
R = 8.314 J mol–1 K–1 ln 3.555 = 1.268
Answer
100
8
The atomic number of Unnilunium is _______.
Answer
101
9
If the solubility product of AB2 is 3.20 $$ \times $$ 10–11 M3,
then the solubility of AB2 in pure water is
_____ $$ \times $$ 10–4 mol L–1.
[Assuming that neither kind
of ion reacts with water]
Answer
2
10
A solution of phenol in chloroform when treated
with aqueous NaOH gives compound P as a
major product. The mass percentage of carbon
in P is ______. (to the nearest integer)
(Atomic mass : C = 12; H = 1; O = 16)
Answer
69
11
For a d4 metal ion in an octahedral field, the
correct electronic configuration is :
Answer
(D)
$$t_{2g}^3e_g^1$$ when $$\Delta $$0 < P
12
The increasing order of the boiling points of
the major products A, B and C of the following
reactions will be :
A set of solutions is prepared using 180 g of
water as a solvent and 10 g of different nonvolatile solutes A, B and C. The relative
lowering of vapour pressure in the presence of
these solutes are in the order :
[Given, molar
mass of A = 100 g mol–1; B = 200 g mol–1;
C = 10,000 g mol–1]
Answer
(C)
A > B > C
16
For the given cell :
Cu(s) | Cu2+(C1M) || Cu2+(C2M) | Cu(s)
change in Gibbs energy ($$\Delta $$G) is negative, if :
Answer
(A)
C2 = $$\sqrt 2 $$C1
17
Which one of the following statements is not
true?
Answer
(A)
Lactose contains $$\alpha $$-glycosidic linkage
between C1 of galactose and C4 of glucose
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