JEE MAIN - Chemistry (2019 - 12th April Evening Slot)
1
In which one of the following equilibria, Kp $$ \ne $$ KC ?
Answer
(B)
2C(s) + O2(g) ⇋ 2CO(g)
2
Benzene diazonium chloride on reaction with aniline in the presence of dilute hydrochloric acid gives :
Answer
(A)
3
The molar solubility of Cd(OH)2 is 1.84 × 10–5
M in water. The expected solubility of Cd(OH)2 in a buffer
solution of pH = 12 is :
Answer
(A)
2.49 × 10–10 M
4
Which one of the following is likely to give a precipitate with AgNO3 solution ?
Answer
(B)
(CH3)3CCl
5
The compound used in the treatment of lead poisoning is :
Answer
(D)
EDTA
6
In comparison to boron, berylium has :
Answer
(A)
lesser nuclear charge and greater first ionisation enthalpy
7
Consider the following reactions :
'A' is :
Answer
(C)
$$C{H_3} - C \equiv CH$$
8
Heating of 2-chloro-1-phenylbutane with EtOK/EtOH gives X as the major product. Reaction of X with
Hg(OAc)2/H2O followed by NaBH4 gives Y as the major product. Y is :
Answer
(C)
9
Heating of 2-chloro-1-phenylbutane with EtOK/EtOH gives X as the major product. Reaction of X with
Hg(OAc)2/H2O followed by NaBH4 gives Y as the major product. Y is :
Answer
(C)
10
NO2 required for a reaction is produced by the decomposition of N2O5 in CCl4 as per the equation,
2N2O5(g) $$ \to $$ 4NO2(g) + O2(g).
The initial concentration of N2O5 is 3.00 mol L–1
and it is 2.75 mol L–1
after 30 minutes. The rate of
formation of NO2 is :
Answer
(D)
1.667 × 10–2
mol L–1
min–1
11
Which of the given statements is INCORRECT about glycogen?
Answer
(A)
It is a straight chain polymer similar to amylose
12
The pair that has similar atomic radii is :
Answer
(A)
Mo and W
13
The INCORRECT match in the following is :
Answer
(B)
$$\Delta $$Go
< 0, K < 1
14
Thermal decomposition of a Mn compound (X) at 513 K results in compound Y, MnO2 and gaseous product.
MnO2 reacts with NaCl and concentrated H2O4 to give a pungent gas Z. X, Y and Z, respectively, are :
Answer
(A)
KMnO4, K2MnO4 and Cl2
15
The coordination numbers of Co and Al in [Co(Cl)(en)2]Cl and K3[Al(C2O4)3], respectively, are :
(en = ethane-1, 2-diamine)
Answer
(D)
5 and 6
16
25 g of an unknown hydrocarbon upon burning produces 88 g of CO2 and 9 g of H2O. This unknown
hydrocarbon contains :
Answer
(D)
24 g of carbon and 1 g of hydrogen
17
The decreasing order of electrical conductivity of the following aqueous solutions is :
0.1 M Formic acid (A),
0.1 M Acetic acid (B),
0.1 M Benzoic acid (C)
Answer
(C)
A > C > B
18
What will be the major product when m-cresol is reacted with propargyl bromide (HC$$ \equiv $$C–CH2Br) in
presence of K2CO3 in acetone?
Answer
(A)
19
Among the following, the energy of 2s orbital is lowest in :
Answer
(D)
K
20
The IUPAC name for the following compound is :
Answer
(A)
3, 5-dimethyl-4-propylhept-1-en-6-yne
21
An 'Assertion' and a 'Reason' are given below. Choose the correct answer from the following options :
Assertion (A) : Vinyl halides do not undergo nucleophilic substitution easily.
Reason (R) : Even though the intermediate carbocation is stabilized by loosely held p-electrons, the cleavage
is difficult because of strong bonding.
Answer
(C)
(A) is correct statement but (R) is a wrong statement
22
In the following skew conformation of ethane, H'–C–C–H'' dihedral angle is :
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