Name the gas evolved in each of the following cases :Calcium metal is added into water.

Explanation

To answer the question about the gas evolved when calcium metal is added to water, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**: The reactants in this case are calcium metal (Ca) and water (H₂O).

2. **Understand the Reaction**: When calcium metal is added to water, a chemical reaction occurs. Calcium reacts with water to form calcium hydroxide and hydrogen gas.

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