A plot of the number of neutrons (N) against the number of protons (P) of stable nuclei exhibits upward
deviation from linearity for atomic number, Z > 20. For an unstable nucleus having N/P ratio less than 1,
the possible mode(s) of decay is(are)
Answer
B
D
2
According to the Arrhenius equation,
Answer
B
C
D
3
The mole fraction of a solute in a solution is 0.1. At 298 K, molarity of this solution is the same as its
molality. Density of this solution at 298 K is 2.0 g cm–3 . The ratio of the molecular weights of the solute and solvent, $$\left( {{{M{W_{solute}}} \over {M{W_{solvent}}}}} \right)$$, is
Answer
9
4
One mole of an ideal gas at 300 K in thermal contact with surroundings expands isothermally from 1.0 L to
2.0 L against a constant pressure of 3.0 atm. In this process, the change in entropy of surrounding ($$\Delta$$Ssurr)in
JK–1 is (1L atm = 101.3 J)
Answer
(C)
– 1.013
5
The diffusion coefficient of an ideal gas is proportional to its mean free path and mean speed. The absolute
temperature of an ideal gas is increased 4 times and its pressure is increased 2 times. As a result, the
diffusion coefficient of this gas increases x times. The value of x is ___________:
Answer
4
6
The compound(s) with TWO lone pairs of electrons on the central atom is(are)
Answer
B
C
7
P is the probability of finding the 1s electron of hydrogen atom in a spherical shell of infinitesimal thickness, dr, at a distance r from the nucleus. The volume of this shell is $$4\pi r^2dr$$. The quantitative ketch of the dependence of P on r is
Answer
(D)
8
The product(s) of the following reaction sequence is (are)
Answer
(B)
9
Positive Tollen’s test is observed for
Answer
A
B
C
10
In the following mono-bromination reaction, the number of possible chiral product(s) is (are)...
Answer
5
11
In neutral or faintly alkaline solution, 8 moles of permanganate anion quantitative oxidise thiosulphate anions to produce X moles of a sulphur containing product. The magnitude of X is....
Answer
6
12
The possible number of geometrical isomers for the complex [CoL2Cl2]- (L= H2NCH2CH2O-) is (are)...
Answer
5
13
The reagent(s) that can selectively precipitate S2- from a mixture of S2- and SO42- in aqueous solution is (are) :
Answer
A
C
14
The crystalline form of borax has.
Answer
A
C
D
15
The increasing order of atomic radii of the following group 13 elements is
Answer
(B)
Ga < Al < In < Tl
16
On complete hydrogenation, natural rubber produces
Answer
(A)
ethylene-propylene copolymer.
17
Among [Ni(CO)4], [NiCl4]2$$-$$, [Co(NH3)4)Cl2]Cl, Na3[CoF6], Na2O2 and CsO2, the total number of paramagnetic compound is
Answer
(B)
3
18
The correct statements about of the following reaction sequence is (are)
Cumene (C9H12) $$\mathrel{\mathop{\kern0pt\longrightarrow}
\limits_{(ii)\,{H_3}{O^ + }}^{(i)\,{O_2}}} $$ P $$\mathrel{\mathop{\kern0pt\longrightarrow}
\limits_{}^{CHC{l_3}/NaOH}} $$ Q (major) + R (minor)
Q $$\mathrel{\mathop{\kern0pt\longrightarrow}
\limits_{PhC{H_2}Br}^{NaOH}} $$ S
