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Question Bank No: 2

1. Hl was heated in a sealed tube at $440^{o} C$ till the equilibrium was reached. Hl was found to be 22% decomposed. The equilibrium constant for dissociation is

a)		0.282
b)		1.99
c)		0.0199
d)		0.0796

2. An acidic buffer solution can be prepared by mixing solution

a)		ammonium chloride and HCl
b)		$H_{2} {SO}_{4}$ and ${Na}_{2} {SO}_{4}$
c)		acetic acid and sullphuric acid
d)		Sodium acetate and acetic acid

3. Which of the following is not a Lewis acid ?

a)		B $F_{3}$
b)		AlC $l_{3}$
c)		SnC $l_{4}$
d)		CC $l_{4}$

4. The pH of 0.1 M solution of a weak acid is 3. What is the value of ionisation constant for the acid?

a)		0.1
b)		$10^{- 3}$
c)		$10^{- 5}$
d)		$10^{- 7}$

5. $K_{1} and K_{2}$ are equilibrium constants for reactions 1 and 2.
$N_{2} (g) + O_{2} (g) \overset{}{⇌ 2 NO (g) .... (1)}$
$NO (g) \overset{}{⇌ \frac{1}{2} N_{2} (g {) + \frac{1}{2} O_{2} (g) .... (2)}_{}}$ , then

a)		$K_{1} = {(\frac{1}{K_{2}})}^{2}$
b)		$K_{1} = K_{2}^{2}$
c)		$K_{1} = \frac{1}{K_{2}}$
d)		$K_{1} = (K_{2})^{0}$

6. When pressure is applied to the equilibrium system , ice $\overset{}{⇌} water,$ which of the following phenomenon will happen

a)		more ice will be formed
b)		water will evaporate
c)		more water will be formed
d)		equilibrium will not be formed

7. For reaction ${PCl}_{3} (g) + {Cl}_{2} (g) \overset{}{⇌} {PCl}_{5} (g),$ the value of $K_{c} at 250^{0} C$ is 26. The value of $K_{p} at this temperature will be$

a)		0.6063
b)		0.57
c)		0.83
d)		0.46

8. The state of equilibrium refers to

a)		state of rest
b)		dynamic state
c)		stationary state
d)		state of inertness

9. At certain temperature, 50% of $HI$ is dissociated into $H_{2}$ and $I_{2},$ the equilibrium constant is

a)		1.0
b)		3.0
c)		3.5
d)		0.25