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Characteristics of Chemical Equilibrium

For which of ...

Question

For which of the following reactions, the degree of dissociation cannot be calculated from the vapour density data
I. $2 H I_{(g)} ⟶ H_{2 (g)} + I_{2 (g)}$
II. $2 N H_{3 (g)} ⟶ N_{2 (g)} + 3 H_{2 (g)}$
III. $2 N O_{(g)} ⟶ N_{2 (g)} + O_{2 (g)}$
IV. $P C l_{5 (g)} ⟶ P C l_{3 (g)} + C l_{2 (g)}$

A

I

and

I I I

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B

I I

and

I V

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C

I

and

I I

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D

I I I

and

I V

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Solution

The correct option is B $I$ and $I I I$
For the reactions I and III, the number of moles of the reactants is same as that of the products. Hence, for these reactions, the degree of dissociation cannot be calculated from the vapour density data.

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Q. For which of the following reactions, the degree of dissociation cannot be calculated from the vapour density data

I . 2 H I_{(g)} ⇌ H_{2 (g)} + I_{2 (g)}

I I . 2 N H_{3 (g)} ⇌ N_{2 (g)} + 3 H_{2 (g)}

I I I . 2 N O_{(g)} ⇌ N_{2 (g)} + O_{2 (g)}

I V . P C l_{5 (g)} ⇌ P C l_{3 (g)} + C l_{2 (g)}

Q. Consider following reaction in equilibrium with equilibrium concentration 0.01 M of every species
(I)

P C l_{5} (g) ⇌ P C l_{3} (g) + C l_{2} (g)

2 H I (g) ⇌ H_{2} (g) + I_{2} (g)

N_{2} (g) + 3 H_{2} (g) ⇌ 2 N H_{3} (g)

Extend of the reaction taking place is:

Q. Match the column I with column II and mark the appropriate choice:

S.No.	Column I	S.No.	Column II
(A)	$H_{2} (g) + B r_{2} (g) \to 2 H B r (g)$	(i)	$△ H = △ U - 2 R T$
(B)	$P C l_{5 (g)} \to P C l_{3 (g)} + C l_{2 (g)}$	(ii)	$△ H = △ U + 3 R T$
(C)	$N_{2 (g)} + 3 H_{2 (g)} \to 2 N H_{3 (g)}$	(iii)	$△ H = △ U$
(D)	$2 N_{2} O_{5 (g)} \to 4 N o_{2 (g)} + O_{2 (g)}$	(iv)	$△ H = △ U + R T$

Q. Consider the following reactions in equilibrium with initial concentration of 0.01 M of every species (assuming the same equilibrium constant same).
(I)

P C l_{5} (g) ⇌ P C l_{3} (g) + C l_{2} (g)

2 H I (g) ⇌ H_{2} (g) + I_{2} (g)

N_{2} (g) + 3 H_{2} (g) ⇌ 2 N H_{3} (g)

Arrange these reactions in the order of the extent to which it takes place.

Q. Consider following reactions in equilibrium with equilibrium concentration

0.01 M

of every species.
(I)

P C l_{s} (g) ⇌ {P C l}_{3} (g) + C l_{2} (g)

{2 H I (g) ⇋ H}_{2} (g) + l_{2} (g)

N_{2} (g) + 3 H_{2} (g) ⇋ {2 N H}_{3} (g)

Extent of the reactions taking place is:

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