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In a flask, colourless N(2)O(4) is in eq...

In a flask, colourless `N_(2)O_(4)` is in equilibrium with brown-coloured `NO_(2)`. At equilibrium, when the flask is heated to `100^(@)C` the brown colour deepens and on cooling, the brown colour became less coloured. The change in enthalpy `DeltaH` for the ayatem is

A

(a)Negative

B

(b)Positive

C

(c )Zero

D

(d)Undefined

Text Solution

Verified by Experts

The correct Answer is:
B
On heating
` N_(2)O_(4) hArr 2NO_(2)` if `NO_(2)` is formed more, it more it means `DeltaH=+ve` because endothermic reaction are favoured with increase in temperature.
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