Sign In

JEE MAIN - Chemistry (2019 - 10th April Morning Slot)

1
The oxoacid of sulphur that does not contain bond between sulphur atoms is
Answer
(A)
H2S2O7
2
The increasing order of the reactivity of the following compounds towards electrophilic aromatic substitution reactions is :
Answer
(B)
III < I < II
3
The graph between $${\left| \psi \right|^2}$$ and r (radial distance) is shown below. This represents :
Answer
(B)
2s orbital
4
The major product of the following reaction is :
Answer
(C)
5
During the change of O2 to O2- , the incoming electron goes to the orbital :
Answer
(C)
$${\pi ^*}2{p_x}$$
6
Three complexes,
[CoCl(NH3)5] 2+(I),
[Co(NH3)5H2O]3+ (II) and
[Co(NH3)6] 3+(III)
absorb light in the visible region. The correct order of the wavelength of light absorbed by them is :
Answer
(C)
(I) > (II) > (III)
7
The species that can have a trans-isomer is :
(en = ehane-1, 2-diamine, ox = oxalate)
Answer
(C)
[Pt(en)2Cl2]2+
8
The major product of the following reaction is :
Answer
(A)
9
At room temperature, a dilute solution of urea is prepared by dissolving 0.60 of urea in 360 g of water. If the vapour pressure of pure water at this temperature is 35 mm Hg, lowering of vapour pressure will be. (molar mass of urea = 60 g mol–1)
Answer
(B)
0.017 mmHg
10
The principle of column chromatography is :
Answer
(C)
Differential adsorption of the substances on the solid phase.
11
A process will be spontaneous at all temperatures if :
Answer
(A)
$$\Delta $$H < 0 and $$\Delta $$S > 0
12
At 300 K and 1 atmospheric pressure, 10 mL of a hydrocarbon required 55 mL of O2 for complete combustion, and 40 mL of CO2 is formed. The formula of the hydrocarbon is :
Answer
(B)
C4H6
13
Consider the following statements
(a) The pH of a mixture containing 400 mL of 0.1 M H2SO4 and 400 mL of 0.1 M NaOH will be approximately 1.3
(b) Ionic product of water is temperature dependent.
(c) A monobasic acid with Ka = 10–5 has pH = 5. The degree of dissociation of this acid is 50 %.
(d) The Le Chatelier's principle is not applicable to common-ion effect.

The correct statements are :
Answer
(B)
(a), (b) and (c)
14
A bacterial infection in an internal wound grows as N'(t) = N0 exp(t), where the time t is in hours. A does of antibiotic, taken orally, needs 1 hour to reach the wound. Once it reaches there, the bacterial population goes down as $${{dN} \over {dt}} = - 5{N^2}$$. What will be the plot of $${{{N_0}} \over N}$$ vs. t after 1 hour?
Answer
(D)
15
The major product of the following reaction is :
Answer
(B)
16
Major products of the following reaction are :
Answer
(C)
17
Consider the hydrated ions of Ti2+, V2+, Ti3+, and Sc3+. The correct order of their spin-only magnetic moments is :
Answer
(B)
Sc3+ < Ti3+ < Ti2+ < V2+
18
The isoelectronic set of ions is :
Answer
(C)
N3–, O2-, F- and Na+
19
Consider the statements S1 and S2

S1 : Conductivity always increases with decrease in the concentration of electrolyte.

S2 : Molar conductivity always increases with decrease in the concentration of electrolyte.

The correct option among the following is :
Answer
(D)
S1 is wrong and S2 is correct
20
Ethylamine (C2H5NH2) can be obtained from N-ethylphatalimide on treatment with :
Answer
(D)
NH2NH2
21
Amylopectin is compound of :
Answer
(A)
$$\alpha $$-D-glucose, C1 – C4 and C1 – C6 linkages
22
Ethylamine (C2H5NH2) can be obtained from N-ethylphatalimide on treatment with :
Answer
(D)
NH2NH2