Describe the reactions and identify substance A in Chamber I.

In Chamber I, zinc oxide ($\text{ZnO}$), which is a basic oxide, reacts with sulphuric (VI) acid ($\text{H}_2\text{SO}_4$). This is an acid-base reaction.
The type of reaction taking place in Chamber I is a neutralization reaction.

From the context of 4(a), Chamber I involves $\text{ZnO}(s) + \text{H}_2\text{SO}_4(aq) \to \text{ZnSO}_4(aq) + \text{H}_2\text{O}(l)$.
Substance A is therefore zinc sulphate ($\text{ZnSO}_