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When a sample of \( \mathrm{NO}_{2} \) is placed in a container, this equilibrium is rapidly established.
\[
2 \mathrm{NO}_{2}(g) \rightleftharpoons \mathrm{N}_{2} \mathrm{O}_{4}(g)
\]
\( \mathrm{P} \)
If this equilibrium mixture is a darker colour at high temperatures and at low pressure, which of these statements about the reaction is true?
W
(a) The reaction is exothermic and \( \mathrm{NO}_{2} \) is darker in colour than \( \mathrm{N}_{2} \mathrm{O}_{4} \)
(b) The reaction is exothermic and \( \mathrm{N}_{2} \mathrm{O}_{4} \) is darker in colour than \( \mathrm{NO}_{2} \)
(c) The reaction is endothermic and \( \mathrm{NO}_{2} \) is darker in colour than \( \mathrm{N}_{2} \mathrm{O}_{4} \)
(d) The reaction is endothermic and \( \mathrm{N}_{2} \mathrm{O}_{4} \) is darker in colour than \( \mathrm{NO}_{2} \)
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