Complete the following chemical equations :
`C_2 H_2 + H_2 overset(Ni)to`

Explanation

To complete the chemical equation for the reaction between acetylene (C₂H₂) and hydrogen (H₂) in the presence of nickel (Ni), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants and Products**:
- The reactants are acetylene (C₂H₂) and hydrogen (H₂).
- The product formed from this reaction is ethane (C₂H₆).

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