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

Options

A. `(a)` The `DeltaH` for the reaction `:`
`N_(2)O_(4(g)) hArr 2NO_(2(g))` is `+ve`
B. Paramagnetic decreases on cooling
C. The `DeltaH-DeltaU` at `100^(@)C` is equal to `200cal`
D. Dimerisation is reduced on heating

Answer

C

Explanation

`DeltaH-DeltaU=DeltanRT=1xx2xx373=746 cal`