Complete the following chemical equtions :
(i) `Ca_(3)P_(2)+H_(2)O to`
(ii) `Cu+ H_(2)SO (conc) to`

Explanation

Let's solve the given chemical equations step by step.

### (i) Completing the equation:
**Given:** \( \text{Ca}_3\text{P}_2 + \text{H}_2\text{O} \)

1. **Identify the reactants:** We have calcium phosphide (\( \text{Ca}_3\text{P}_2 \)) and water (\( \text{H}_2\text{O} \)).
2. **Determine the products:** When calcium phosphide reacts with water, it produces calcium hydroxide (\( \text{Ca(OH)}_2 \)) and phosphine (\( \text{PH}_3 \)).
3. **Write the unbalanced equation:**
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