A gas syringe was charged with some nitrogen dioxide gas. The syringe tip is then sealed. A reversible reaction takes place and eventually equilibrium is established: $2\text{NO}_2(\text{g}) \rightleftharpoons \text{N}_2\text{O}_4(\text{g})$. The forward reaction is exothermic. Which statement about this reaction is correct?
- AIf the gas syringe is placed in a cold water bath, the colour becomes darker.
- BIf the gas syringe is placed in a hot water bath, the colour becomes lighter.
- CIf the volume in the gas syringe is increased, the colour becomes lighter.
- DIf the volume in the gas syringe is decreased, the colour becomes lighter.