When a simple of $$NO_{2}$$ is placed in a container, this equilibrium is rapidly established:

$$2NO_{2}(g)\rightleftharpoons N_{2}O_{4}(g)$$

If this equilibrium mixture is a darker colour at high temperature and at low pressures, which one of these statements about the reaction is true?

A

The reaction is endothermic and $$N_{2}O_{4}$$ is darker in colour than $$NO_{2}$$

B

The reaction is endothermic and $$NO_{2}$$ is darker in colour than $$N_{2}O_{4}$$

C

The reaction is exothermic and $$N_{2}O_{4}$$ is darker in colour than $$NO_{2}$$

D

The reaction is exothermic and $$NO_{2}$$ is darker in colour than $$N_{2}O_{4}$$