STATEMENT - 1 : The plot of atomic number (y-axis) versus number of neutrons (x-axis) for stable nuclei shows a curvature towards x-axis from the line of 45o slope as the atomic number is increased.
STATEMENT - 2 : Proton-proton electrostatic repulsions begin to overcome attractive forces involving protons and neutrons in heavier nuclides
Answer
(A)
Statement - 1 is True, Statement - 2 is True; Statement - 2 is a correct explanation for Statement - 1
2
Hyperconjugation involves overlapping of the following orbitals:
Answer
(B)
$$\sigma-p$$
3
The major product of the following reaction is:
Answer
(A)
4
Aqueous solutions of Na$$_2$$S$$_2$$O$$_3$$ on reaction with Cl$$_2$$ gives:
Answer
(B)
NaHSO$$_4$$
5
Native silver metal forms a water soluble complex with a dilute aqueous solution of NaCN in the presence of:
Answer
(B)
oxygen
6
Under the same reaction conditions, initial concentration of 1.386 mol dm$$^{-3}$$ of a substance becomes half in 40 seconds and 20 seconds through first order and zero order kinetics, respectively. Ratio $$\left( {{{{k_1}} \over {{k_0}}}} \right)$$ of the rate constants for first order ($$k_1$$) and zero order ($$k_0$$) of the reactions is:
Answer
(A)
0.5 mol$$^{-1}$$ dm$$^3$$
7
2.5 mL of $$\frac{2}{5}$$M weak monoacidic base (K$$_b$$ = 1 $$\times$$ 10$$^{-12}$$ at 25$$^\circ$$C) is titrated with $$\frac{2}{15}$$M HCl in water at 25$$^\circ$$C. The concentration of H$$^+$$ at equivalence point is (K$$_w$$ = 1 $$\times$$ 10$$^{-14}$$ at 25$$^\circ$$C).
Answer
(D)
2.7 $$\times$$ 10$$^{-2}$$ M
8
The correct statement(s) about the compound given below is(are):
Answer
A
D
9
The correct statement(s) concerning the structures E, F and G is(are) :
Answer
B
C
D
10
A solution of colourless salt H on boiling with excess NaOH produces a non-flammable gas. The gas evolution ceases after sometime. Upon addition of Zn dust to the same solution, the gas evolution restarts. The colourless salt(s) H is(are):
Answer
A
B
11
A gas described by van Der Waals equation
Answer
A
C
D
12
Statement 1 : Bromobenzene upon reaction with Br$$_2$$/Fe gives 1, 4-dibromobenzene as the major product.
and
Statement 2: In bromobenzene, the inductive effect of the bromo group is more dominant than the mesomeric effect in directing the incoming electrophile.
Answer
(C)
Statement 1 is True, Statement 2 is False.
13
Statement 1 : Pb$$^{4+}$$ compounds are stronger oxidising agents than Sn$$^{4+}$$ compounds.
and
Statement 2 : The higher oxidation states for the group 14 elements are more stable for the heavier members of the group due to 'inert pair effect'.
Answer
(C)
Statement 1 is True, Statement 2 is False.
14
Statement 1 : For every chemical reaction at equilibrium, standard Gibbs energy of reaction is zero.
and
Statement 2 : At constant temperature and pressure, chemical reactions are spontaneous in the direction of decreasing Gibbs energy.
Answer
(D)
Statement 1 is False, Statement 2 is True.
15
The structure of the product I is :
Answer
(D)
16
The structure of compounds J and K, respectively, are:
Answer
(A)
17
The structure of product L is :
Answer
(C)
18
Among the following, the correct statement is:
Answer
(C)
Between nitrates and phosphates, nitrates are less abundant in earth's crust.
19
Among the following, the correct statement is :
Answer
(C)
Between NH$$_3$$ and PH$$_3$$, NH$$_3$$ is a better electron donor because the lone pair of electrons occupies sp$$^3$$ orbital and is more directional.
20
White phosphorus on reaction with NaOH gives PH$$_3$$ as one of the products. This is a:
Answer
(B)
disproportionation reaction
21
The freezing point of the solution M is :
Answer
(D)
150.9 K
22
The vapour pressure of the solution M is :
Answer
(B)
36.0 mm Hg
23
Water is added to the solution M such that the fraction of water in the solution becomes 0.9 mole. The boiling point of this solution is:
