# 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: 1. $\alpha \propto P$                                          2.  $\alpha \propto 1/\sqrt{P}$ 3.  $\alpha \propto 1/{\mathrm{P}}^{2}$                                    4.  $\alpha \propto 1/{P}^{4}$

Subtopic:  Introduction To Equilibrium |
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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:

1. two times of its original value

2. one half of its original value

3. 2$\sqrt{2}$ times of its original value

4. $\frac{1}{2\sqrt{2}}$ times of its original value

Subtopic:  Kp, Kc & Factors Affecting them |
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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

1. 99.9%

2. 1.00%

3. 99.9%

4. 0.100%

Subtopic:  Ionisation Constant of Acid, Base & Salt |
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If little heat is added to ice $⇌$ liquid equilibrium in a sealed container, then:

1. Pressure will rise

2. Temperature will rise

3. Temperature will fall

4. No change in P and T

Subtopic:  Kp, Kc & Factors Affecting them |
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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.

1. 0.4 atm

2. 1.0 atm

3. 0.8 atm

4. 0.25 atm

Subtopic:  Kp, Kc & Factors Affecting them |
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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.

1. 3.4 X 10-4

2. 3.4 X 10-3

3. 6.8 X 10-4

4. 6.8 X 10-3

Subtopic:  Ionisation Constant of Acid, Base & Salt |
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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:

1. 30

2. 15

3. 5

4. 3

Subtopic:  Introduction To Equilibrium |
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For the equilibrium, PCl5 $⇌$ PCl3 + Cl2,

${\mathrm{K}}_{\mathrm{C}}={\mathrm{\alpha }}^{2}/\left(1-\mathrm{\alpha }\right)\mathrm{V}$, temperature remaining constant:

1. Kc will increase with the increase in volume

2. Kc will increase with the decrease in volume

3. Kc will not change with the change in volume

4. Kc may increase or decrease with the  change in volume depending upon its numerical value.

Subtopic:  Kp, Kc & Factors Affecting them |
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For the reaction,

PCl5(g) PCl3(g) + Cl2 (g)

The forward reaction at constant temperature is favoured by

1. Introducing an inert gas at a constant volume

2. Introducing chlorine gas at a constant volume

3. Introducing an inert gas at constant pressure

4. None of the above

Subtopic:  Le Chatelier's principle |
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In the dissociation of 2HI $⇌$H2 + I2, the degree of dissociation will be influenced by the:

1. addition of inert gas at constant volume

2. addition of inert gas at constant pressure

3. increase of temperature

4. increase of pressure

Subtopic:  Kp, Kc & Factors Affecting them |
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