Equal volumes of three acid solutions of pH 3, 4 and 5 are mixed in a vessel. What will be

the H⁺ ion concentration in the mixture?

1. 1.11 x 10^-4 M             

2. 3.7 x 10^-4 M

3. 3.7 x 10^-3  M             

4. 1.11 x 10^-3 M

The value of equilibrium constant of the reaction HI (g) $\rightleftharpoons$ $\frac{1}{2}$ H₂(g) + $\frac{1}{2}$ I₂(g) is 8.0. The equilibrium constant of the reaction

H₂(g) + I₂(g) $\rightleftharpoons$2HI(g) will be

$$\begin{gathered} 1. \frac{1}{16} \\ 2. \frac{1}{64} \\ 3. 16 \\ 4. \frac{1}{8} \end{gathered}$$

Which one of the following ionic species has the greatest proton affinity to form stable compound?

(1) HS^-                         

(2) ${\mathrm{NH}}_2^{-}$

(3) F^-                           

(4) I^-

For the reaction,

 CH₄(g) + 2O₂(g) $\rightleftharpoons$CO₂(g) + 2H₂O (l),

 $∆$_rH = -170.kJ mol-1

Which of the following statements is not true?

(a) At equilibrium, the concentrations of CO₂(g) and H₂O(l) are not equal

(b) The equilibrium constant for the reaction is given by K_p = [CO₂]/[CH₄][O₂]

(c) Addition of CH₄(g) or O₂ (g) at equilibrium will cause a shift to the right

(d) The reaction is exothermic

The hydrogen ion concentration of a 10^-8 M HCl aqueous solution at 298 K (K_w = 10^-14) is:

(1) 1.0×10^-6 M

(2) 1.0525 x 10^-7 M

(3) 9.525 x 10^-8 M

(4) 1.0×10^-8 M

The equilibrium constant for the reaction 

$N{H}_{4}N{O}_2\left(s\right)$$N_2\left(g\right) + 2H_{2}O\left(g\right)$ is given by

(1) $\frac{\left[N_2\right]\left[H_{2}O\right]}{\left[N{H}_{4}N{O}_2\right]}$

(2) $\left[{\mathrm{N}}_2\right]{\left[{\mathrm{H}}_2\mathrm{O}\right]}^2$

(3) $\frac{\left[H_{2}O\right]}{\left[N{H}_{4}N{O}_2\right]}$

(4) $\frac{\left[N_2\right]}{\left[N{H}_{4}N{O}_2\right]}$

Two flasks A and B of equal volume containing 1 mole and 2 mole of O₃ respectively, are heated to the sametemperature. When the reaction 2O₃ $\underset{}{\overset{}{\leftrightharpoons }}$3O₂ practically stops, then both the flasks shall have

(1) the same ratio [O₂] /[O₃]

(2) the same ratio : [O₂]³/²/[O₃]

(3) only O₂

(4) the same time to reach equilibrium

A 10L container at 300K contains CO₂ gas at pressure of 0.2 atm and an excess solid CaO (neglect thevolume of solid CaO). The volume of container is now decreased by moving the movable piston fitted in the container. What will be the maximum volume of container when pressure of CO₂ attains its maximum value given that CaCO₃ (s) $\underset{}{\overset{}{\leftrightharpoons }}$ CaO(s) + CO₂(g)K_ph = 0.800 atm

1. 5 L

2. 2.5 L

3. 1 L

4. The information is insufficient.

An equilibrium mixture at 700 K of 0.50 M N₂, 3.00 M H₂ and 2.00 M NH₃ is present in a container. Now if this equilibrium is disturbed by adding N₂ so that its concentration becomes 1.50 M just after addition then which of the following graphs represents the above situation more appropriately –

(1)

(2)

(3)

(4)

At 1400 K, K_c= 2.5x10^-3 for the reaction CH₄(g) + 2H₂S(g) $\underset{}{\overset{}{\rightleftharpoons }}$ CS₂(g) + 4H₂(g). A 10.0L reaction vesselat 1400 K contains 2.00 mole of CH₄, 3.0 mol of CS₂, 3.0 mole of H₂ and 4.0 mole of H₂S. Then