IIT JEE Chemistry Final Revision Set 22

1. A sodium salt of an unknown anion when treated with MgCl2 gives white precipitate only on boiling.
The anion is
(a) SO₄^2- (b) HCO₃^- (c) CO₃ ^2- (d) NO₃^-

2. 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⁺

3. 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%

4. Number of lone pair(s) in XeOF4 is/are:

(a) 0 (b) 1 (c) 2 (d) 3

5. According to MO Theory,
(a) O₂⁺ is paramagnetic and bond order greater than O₂
(b) O₂⁺ is paramagnetic and bond order less than O₂
(c) O₂⁺ is diamagnetic and bond order less than O₂
(d) O₂⁺ is diamagnetic and bond order is more than O₂