The percentage of pyridine (C₅H₅N) that forms pyridinium ion (C₅H₅N⁺H) in a 0.10 M aqueous pyridine solution (K_b for C₅H₅N = 1.7 x 10^-9) is

(1) 0.0060 %                 

(2) 0.013 %

(3) 0.77 %                     

(4) 1.6%

The solubility of AgCl (s) with solubility product 1.6 x 10^-10 in 0.1 M NaCl solution would be

(1) 1.26 x 10^-5 M               

(2) 1.6 x 10^-9 M

(3) 1.6 x 10^-11 M               

(4) zero

Boric acid is an  acid because its molecule

(1) contains replaceable H⁺ ion

(2) gives up a proton

(3) accepts OH^- from water releasing proton

(4) combines with proton from water molecule

Which of the following fluoro-compounds is most likely to behave as a Lewis base?
(1) BF₃

(2) PF₃

(3) CF₄

(4) SiF₄

Among the following, the correct order of acidity is

1. HClO < HClO₂ < HClO₃ < HClO₄

2. HClO₂ < HClO < HClO₃ < HCLO₄

3. HClO₄ < HClO2 < HClO < HClO₃

4. HClO₃ < HClO₄ < HClO₂ < HClO

MY and NY₃ , two nearly insoluble salts, have the same Ksp values of 6.2 x 10^-13 at room

temperature. Which statement would be true in regard to MY and NY₃?

1. The molar solubility of MY in water is less than that of NY₃

2. The salts MY and NY₃ are more soluble in 0.5 M KY than in pure water

3. The addition of the salt of KY to solution of MY and NY₃ will have no effect on their

solubilities

4. The molar solubilities of MY and NY₃ in water are identical

Consider the nitration of benzene using mixed conc. H₂SO₄ and HNO₃. If a large amount

of KHSO₄ is added to the mixture, the rate of nitration will be

1. slower 

2. unchanged

3. doubled

4. faster

Concentration of the Ag⁺ ions in a saturated solution of Ag₂C₂O₄ is 2.2 x 10^-4 mol^-1 solubility product of Ag₂C₂O₄ is

1. 2.42 x 10^-8

2. 2.66 x 10^-12

3. 4.5 x 10^-11

4. 5.3 x 10^-12

A 20 litre container at 400 K contains CO₂(g) at pressure 0.4 atm and an excess of SrO (neglect the volume of solid SrO). The volume of the container is now decreased by moving the movable piston fitted in the container. The maximum volume of the container, when the pressure of CO₂ attains its maximum value, when the pressure of C02 attains its maximum value, will be

(Given that: SrCO₃(s) $\rightleftharpoons$ SrO(s) + CO₂(g), (Kp =1.6 atm))

(1) 5 L

(2) 10 L

(3) 4L

(4) 2L

Given are three reactions and their equilibrium constants : 
$$\begin{gathered} {\mathrm{N}}_2+3{\mathrm{H}}_2 \rightleftarrows 2{\mathrm{NH}}_{3 } {\mathrm{K}}_1 \\ {\mathrm{N}}_2+{\mathrm{O}}_2 \rightleftarrows 2\mathrm{NO} {\mathrm{K}}_2 \\ {\mathrm{H}}_2+\frac{1}{2}{\mathrm{O}}_2 \to {\mathrm{H}}_2\mathrm{O} {\mathrm{K}}_3 \end{gathered}$$

The equilibrium constant (K) of the following reaction will be : 
$2{\mathrm{NH}}_3+\frac{5}{2}{\mathrm{O}}_2 \stackrel{\mathrm{K}}{\rightleftarrows } 2\mathrm{NO}+3{\mathrm{H}}_2\mathrm{O}$
1. K₂K₃³/K₁
2. K₂K₃/K₁
3. K₂³K₃/K₁
4. K₁K₃³/K₂