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When a sample of $NO_2$ is placed in a container, this equilibrium is rapidly established. $2N{O_2}\left( g \right) \rightleftharpoons {N_2}{O_4}\left( g \right)$ If this equilibrium mixture is a darker colour at high temperatures and at low pressure , which of these statements about the reaction is true?

• ✓
  The reaction is exothermic and $NO_2$ is darker in colour than $N_2O_4$
• B
  The reaction is exothermic and $N_2O_4$ is darker in colour than $NO_2$
• C
  The reaction is endothermic and $NO_2$ is darker in colour than $N_2O_4$
• D
  The reaction is endothermic and $N_2O_4$ is darker in colour than $NO_2$