7404/2 Chemistry Jun 2018 Quiz | AQA AS Level MCQ

A pale brown mixture of NO$_2$ and N$_2$O$_4$ is allowed to reach equilibrium in a sealed gas syringe according to the following equation.
2NO$_2$(g) $\rightleftharpoons$ N$_2$O$_4$(g)
When the plunger is pushed further into the syringe the pressure increases and the mixture becomes paler in colour.
When the syringe is placed in a hot oven the mixture becomes darker in colour.
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