Question

14.
During thermal dissociation of a gas, the vapour density
(A) remains the same
(B) increase
(C) decreases
(D) increase in some cases and decrease in other​

Answer 1

Answer:

c)

Explanation:

during the thermal dissociation, the molar mass decreases. Therefore, the vapour density of the gas will decrease. Therefore, the correct option for this question is (c).

Answer 2

During thermal dissociation of a gas, the vapour density decreases as the molecular weight also decreases.

Molecular weight =2× vapour density.

For example, consider the dissociation N

2

O

4

⇌2NO

2

The molecular weight of NO

2

is one half the molecular weight of N

2

O

4

.

So, the vapour density of NO

2

is also one half the vapour density of N

2

O

4

Hopeit help you ✌✌✌

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