When a sample of `NO_(2)` is placed in a container, the equilibrium is rapidly established. If the equilibrium mixture is of a darker colour at high temperalures and at low pressures, which of the following statements about the reaction is true ? ` 2NO_(2) (g ) - Q hArr N_(2) O_(4)` (g)

Options

A. Formation of `N_(2)O_(4)` from `NO_(2)` is exothermic and `N_(2)O_(4)` is darker in colour than `NO_(2)`
B. Formation of `N_(2)O_(4)` from `NO_(2)` is exothermic and `N_(2)O_(4)` is darker in colour than `NO_(2)O_(4)`
C. Rate of transformation of `NO_(2)` to `N_(2)O_(4)` is equal to the rate of transformation of `N_(2)O_(4)` to `NO_(2)` at equilibrium
D. There is no change in the concentrations, colour, vapour density of reaction mixture, at equilibrium

Answer

B, C, D