Name the gas produced on treating calcium hydride with water.

Explanation

To solve the question of what gas is produced when calcium hydride reacts with water, we can follow these steps:

### Step 1: Identify the Reactants
The reactants in this reaction are calcium hydride (CaH₂) and water (H₂O).

### Step 2: Write the Chemical Reaction
When calcium hydride reacts with water, it produces calcium hydroxide and hydrogen gas. The unbalanced chemical equation is:
\[ \text{CaH}_2 + \text{H}_2\text{O} \rightarrow \text{Ca(OH)}_2 + \text{H}_2 \]
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