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An example of homogeneous equilibrium among the following is:

1.	$2SO_{2 (g)} + O_{2(g)} \rightleftharpoons 2SO_3(g)$
2.	$C_{(s) }+ H_2O_{(g)} \rightleftharpoons CO_{(g)} + H_{2(g)}$
3.	$CaCO_{3(s)} \rightleftharpoons CaO_{(s)} + CO_{2(g)}$
4.	$NH_4HS_{(s)} \rightleftharpoons NH_{3(s)} + H_2S_{(g)}$

Subtopic: Introduction To Equilibrium |

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Level 1: 80%+

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Q2:

What is the term used to define the temperature at which the solid and liquid phases of a pure substance can exist in equilibrium at a particular temperature and atmospheric pressure?

(a) Normal melting point

(b) Equilibrium temperature

(c) Boiling point

(d) Freezing point

Choose the correct option:

1.	(a, b)	2.	(b, c)
3.	(c, d)	4.	(a, d)

Subtopic: Introduction To Equilibrium |

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Level 3: 35%-60%

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Q3:

Match the following equilibria with the corresponding condition.

A.	Liquid ⇌ Vapour	I.	Saturated solution
B.	Solid ⇌ Liquid	II.	Boiling point
C.	Solid ⇌ Vapour	III.	Sublimation point
D.	Solute (s) ⇌ Solute (solution)	IV.	Melting point
		V	Unsaturated solution

Codes:

	A	B	C	D
1.	II	IV	III	I
2.	I	II	III	V
3.	V	IV	III	II
4.	IV	V	III	II

Subtopic: Introduction To Equilibrium |

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Level 1: 80%+

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Q4:

An incorrect statement about equilibrium among the following is:

1.	Equilibrium is possible only in a closed system at a constant temperature.
2.	All measurable properties of the system remain constant.
3.	All the physical processes stop at equilibrium.
4.	The opposing processes occur at the same rate and there is a dynamic but stable condition.

Subtopic: Introduction To Equilibrium |

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Level 2: 60%+

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Q5:

For the reaction $2A(g)\rightleftharpoons B(g)+3C(g) $ at a given temperature, $K_C=16 $. What must be the volume of the flask, if a mixture of 2 moles each of A, B, and C exist in equilibrium?
1. $\dfrac14 $
2. $\dfrac12 $
3. $1 $
4. None of the above

Subtopic: Introduction To Equilibrium |

73%

Level 2: 60%+

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Q6:

PCl₅, PCl₃, and Cl₂ are at equilibrium at 500 K in a closed container and their concentrations are 0.8×10^–3 mol L^–1 , 1.2×10^–3 mol L^–1and 1.2×10^–3 mol L^–1, respectively.
The value of K_c for the reaction PCl₅(g) ⇌ PCl₃(g) + Cl₂(g) will be:
1. 1.8 × 10³ mol L^–1
2. 1.8 × 10³
3. 1.8 × 10^–3mol L^–1
4. 0.55 × 10⁴

Subtopic: Kp, Kc & Factors Affecting them |

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Q7:

Find the equilibrium constant (K_c) at 500 K for:

2HI(g) ⇌ H₂(g) + I₂(g)

given that:

½H₂(g) + ½I₂(g) ⇌ HI(g), K_c= 5

1. 0.04

2. 0.4

3. 25

4. 2.5

Subtopic: Kp, Kc & Factors Affecting them |

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Q8:

Find the equilibrium constant Kc for the reaction:

H₂O(g) + CO(g) ⇌ H₂(g) + CO₂(g)

Initially, 1 mol each of H₂O and CO are taken in a 10 L vessel at 725 K. At equilibrium, 40% of H₂O reacts.

1.	0.66	2.	0.35
3.	0.44	4.	0.82

Subtopic: Kp, Kc & Factors Affecting them |

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Q9:

A sample of pure PCl₅ was introduced into an evacuated vessel at 473 K.
After equilibrium was attained, a concentration of PCl₅
was found to be 0.5 × 10^–1 mol L^–1. If the value of
K_cis 8.3 × 10^–3mol L^–1, the concentrations of
PCl₃ and Cl₂ at equilibrium would be:

PCl₅_(g) $⇋$ PCl₃ _(g) + Cl_2(g)

1.	$[{PCl}_{3}]$ $=$ $0.02$ $mol$ $L^{- 1}$ $,$ $[{Cl}_{2}]$ $=$ $0.04$ $mol$ $L^{- 1}$
2.	$[{PCl}_{3}] = [{Cl}_{2}]$ $=$ $0.02$ $mol$ $L^{- 1}$
3.	$[{PCl}_{3}]$ $=$ $0.04$ $mol$ $L^{- 1},$ $[{Cl}_{2}]$ $= 0.02$ $mol$ $L^{- 1}$
4.	$[{PCl}_{3}] =$ $[{Cl}_{2}]$ $=$ $0.04$ $mol$ $L^{- 1}$

Subtopic: Kp, Kc & Factors Affecting them |

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Level 2: 60%+

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Q10:

Some reactions are written below in Column I and their equilibrium constants in terms of K_c are written in Column II.
Match the following reactions with the corresponding equilibrium constant:

	Column-I (Reaction)		Column-II (Equilibrium constant)
A.	$2 N_{2} (g) + 6 H_{2} (g) ⇌ 4 {NH}_{3} (g)$	(i)	$2 K_{c}$
B.	$2 {NH}_{3} (g) ⇌ N_{2} (g) + 3 H_{2} (g)$	(ii)	$K_{c}^{1 / 2}$
C.	$\frac{1}{2} N_{2} (g) + \frac{3}{2} H_{2} (g) ⇌ {NH}_{3} (g)$	(iii)	$\frac{1}{K_{c}}$
		(iv)	$K_{c}^{2}$

(Given that reference, Kc is the equilibrium constant for the ammonia synthesis.)

Codes:

	A	B	C
1.	(iv)	(iii)	(ii)
2.	(i)	(ii)	(iii)
3.	(i)	(iv)	(iii)
4.	(iv)	(i)	(iii)

Subtopic: Kp, Kc & Factors Affecting them |

80%

Level 1: 80%+

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1.	\(2SO_{2 (g)} + O_{2(g)} \rightleftharpoons 2SO_3(g)\)
2.	\(C_{(s) }+ H_2O_{(g)} \rightleftharpoons CO_{(g)} + H_{2(g)}\)
3.	\(CaCO_{3(s)} \rightleftharpoons CaO_{(s)} + CO_{2(g)}\)
4.	\(NH_4HS_{(s)} \rightleftharpoons NH_{3(s)} + H_2S_{(g)}\)

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