Saturday, October 10, 2009

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

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

(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) C32-
(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%

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