IIT-JEE-Chemistry-Final Revision Set No.71

1. Spontaneous adsorption of a gas on solid surface is an exothermic process
because:

(a) DH increases for system
(b) DS increases for gas
(c) DS decreases for gas
(d) DG increases for gas

2. Spin only magnetic moment of the compound Hg[Co(SCN)4] is

(a) √3
(b) √15
(c) √24
(d) √8

3. Which hydrogen like species will have same radius as that of Bohr orbit of
hydrogen atom?

(a) n = 2, Li+2
(b) n = 2, Be3+
(c) n = 2, He+
(d) n = 3, Li2+

4. A sodium salt of an unknown anion when treated with MgCI2 gives white
precipitate only on boiling. The anion is

(a) S₄2-
(b) HC₃-
(c) C₃^2-
(d) N₃-

5. 0.004 M Na2SO4 is isotonic with 0.01 M glucose. Degree of dissociation of
Na2SO4 is

(a) 75%
(b) 50%
(c) 25%
(d) 85%