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For which of the following reactions, th...

For which of the following reactions, the degree of dissociation cannot be calculated from the vapour density data.
I. `2HI_((g))hArrH_(2(g))+I_(2(g))`
II. `2NH_(3(g))hArrN_(2(g))+3H_(2(g))`
III. `2NO_((g))hArrN_(2(g))+O_(2(g))`
IV. `PCl_(5(g))hArr PCl_(3(g))+Cl_(2(g))`

A

I and III

B

II and IV

C

I and II

D

III and IV

Text Solution

Verified by Experts

The correct Answer is:
A
The degree of dissociation cannot be calculated from the vapour density data if the number of moles remains unchanged before and after reaching equilibrium.
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