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.
Which of the following statements is correct?
NO$_2$ is brown and the forward reaction is exothermic.
2 )
NO$_2$ is brown and the forward reaction is endothermic.
3 )
NO$_2$ is colourless and the forward reaction is exothermic.
4 )
NO$_2$ is colourless and the forward reaction is endothermic.
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