The conjugate base of H3BO3 is:

(a) $\mathrm{B}\left(\mathrm{OH}{\right)}_{4}^{-}$                                      (b) ${\mathrm{H}}_{2}{\mathrm{BO}}_{3}^{-}$

(c) ${\mathrm{HBO}}_{3}^{2-}$                                       (d) ${\mathrm{H}}_{4}{\mathrm{BO}}_{3}^{+}$

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The degree of dissociation of PCl5 ($\mathrm{\alpha }$) obeying the equilibrium,

PCl5 (g$⇌$ PCl3 (g) + Cl2 (g), is approximately related to the pressure at equilibrium by:

(a) $\alpha \propto P$                                         (b)  $\alpha \propto 1/\sqrt{P}$

(c)  $\alpha \propto 1/{\mathrm{P}}^{2}$                                   (d)  $\alpha \propto 1/{P}^{4}$

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The equilibrium constants ${K}_{{\mathit{P}}_{\mathit{1}}}$ and ${K}_{{P}_{2}}$ for the reactions X$⇌$2Y and Z $⇌$ P + Q respectively are in the ratio of 1:9. If the degree of dissociation ox X and Z be equal then the ratio of total pressure at these equilibria is:

(a) 1:9                 (b) 1:36                 (c) 1:1                     (d) 1:3

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In a system:  If the concentration of C at eqilibrium is increased by a factor 2, it will cause the eqilibrium concentration of B to change to:

(a) two times of its original value

(b) one half of its original value

(c) 2$\sqrt{2}$ times of its original value

(d) $\frac{1}{2\sqrt{2}}$ times of its original value

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For the reaction:

CO(g) + $\frac{1}{2}$O2(g) $⇌$CO2(g), Kp/Kis:

(a) RT              (b) (RT)-1               (c) (RT)-1/2                (d) (RT)1/2

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A weak acid, HA has a Ka of 1.00 x 10-5. If 0.100 mole of this acid is dissolved in one litre of water, the percentage of acid dissociated at equibrium is closest to

(a) 99.9%                             (b) 1.00%

(c) 99.9%                             (d) 0.100%

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If little heat is added to ice $⇌$ liquid equilibrium in a sealed container, then:

(a) pressure will rise                            (b) temperature will rise

(c) temperature will fall                        (d) no change in P and T

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In the equilibrium,

2SO2(g) + O2 (g) $⇌$2SO3(g), the partial pressure of SO2, O2 and SO3 are 0.662, 0.101 and 0.331 atm respectively. What should be the partial pressure of oxygen so that the equilibrium concentration of SO2 and SO3 are equal.

(a) 0.4 atm                    (b) 1.0 atm

(c) 0.8 atm                    (d) 0.25 atm

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Ionisation constant of CH3COOH is 1.7 X 10-5 and concentration of H+ ions is 3.4 X 10-4.Then, find out initial concentration of CH3COOH molecules.             

(a) 3.4 X 10-4

(b) 3.4 X 10-3

(c) 6.8 X 10-4

(d) 6.8 X 10-3

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The formation of phosgene is represented as,

CO + Cl2 $⇌$COCl2

The reaction is carried out in 500 mL flask. At equilibrium o.3 mole of phosgene, 0.1 mole of CO and 0.1 mole of Cl2 are present. The equilibrium constant of the reaction is:

(a) 30                     (b) 15

(c) 5                       (d) 3