1.

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 isA. (a)NegativeB. (b)PositiveC. (c )ZeroD. (d)Undefined

Answer» Correct Answer - 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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