Write balanced chemical equations for the following statements :
(i) NaOH solution is heated with zinc granules
(ii) Excess of carbon dioxide gas is passed through lime water
(iii) Dilute sulphuric acid reacts with sodium carbonate
(iv) Egg shells are dropped in hydrochloric acid
(v) Copper (II) oxide reacts with dilute hydrochloric acid.

Explanation

To write balanced chemical equations for the given statements, we will analyze each reaction step by step.

### (i) NaOH solution is heated with zinc granules.

1. **Identify the reactants and products**: Sodium hydroxide (NaOH) reacts with zinc (Zn) to form sodium zincate (Na2ZnO2) and hydrogen gas (H2).
2. **Write the unbalanced equation**:
\[
\text{NaOH} + \text{Zn} \rightarrow \text{Na}_2\text{ZnO}_2 + \text{H}_2
...