In the following reaction

${\mathrm{HC}}_2{\mathrm{O}}_4^{-} + {\mathrm{PO}}_4^{3-} \rightleftharpoons {\mathrm{HPO}}_4^{2-} + {\mathrm{C}}_2{\mathrm{O}}_4^{2-}$ 

Which are the two Bronsted bases ?

1. ${\mathrm{H}}_2{\mathrm{C}}_2{\mathrm{O}}_4^{-} \mathrm{and} {\mathrm{PO}}_4^{3-}$

2. ${\mathrm{HPO}}_4^{2-} \mathrm{and} {\mathrm{C}}_2{\mathrm{O}}_4^{2-}$

3. ${\mathrm{H}}_2{\mathrm{C}}_2{\mathrm{O}}_4^{-} \mathrm{and} {\mathrm{HPO}}_4^{-2}$

4. ${\mathrm{PO}}_4^{3-} \mathrm{and} {\mathrm{C}}_2{\mathrm{O}}_4^{2-}$

$\frac{{\mathrm{K}}_{\mathrm{p}}}{{\mathrm{K}}_{\mathrm{c}}}$ for the gaseous reaction:

$\mathrm{I}. 2\mathrm{A} + 3\mathrm{B} \rightleftharpoons 2\mathrm{C}$
$\mathrm{II}. 2\mathrm{A}\rightleftharpoons 4\mathrm{B}$
$\mathrm{III}. \mathrm{A}+\mathrm{B}+2\mathrm{C} \rightleftharpoons 4\mathrm{D}$

Would be respectively:

1. (RT)^-3, (RT)², (RT)⁰ 

2. (RT)^-3, (RT)-², (RT)^-1 

3. (RT)^-3, (RT)², (RT) 

4. None of the above

Calculate the molar solublity of Fe(OH)₂ at a pH of 8

[K_sp of Fe(OH)₂ = 1.6 X 10^-14]

1. 0.06

2. 0.016

3. 0.01

4. 0.16

The conjugate acid of azide ion is:

1. NH₃                 2. N₃H

3. N₂H₄                4. ${\mathrm{N}}_2^{-}$

The pH of 0.1 M solution of anilium chloride is (K_a of ${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{NH}}_3^{+}$ = 10^-6)

(1) 3.5

(2) 3

(3) 4.5

(4) none of these

The value of $∆$H for the reaction,

   X₂(g) + 4Y₂(g) $\rightleftharpoons$2XY₄ (g)

is less than zero. Formulation of XY₄(g) will be favored at:                           

1. Low pressure and Low temperature

2. High temperature and Low pressure

3. High pressure and Low temperature

4. High temperature and High pressure

Which salt undergoes hydrolysis?

1. CH₃COONa                                     

2. KNO₃

3. NaCl                                               

4. K₂SO₄