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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

negative

B

positive

C

zero

D

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Text Solution

Verified by Experts

The correct Answer is:
B
On heating `N_2O_4 hArr 2NO_2` is formed more, it means `DeltaH =+ve` because endothermic reactions are favoured with increase in temperature.
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