How is vanaspati ghee prepared from edible oils ?

Explanation

**Step-by-Step Solution:**

1. **Understanding Edible Oils**: Edible oils are primarily composed of unsaturated hydrocarbons, which contain one or more double bonds between carbon atoms.

2. **Hydrogenation Reaction**: To convert these unsaturated hydrocarbons into saturated hydrocarbons, a chemical process called hydrogenation is used. This process involves the addition of hydrogen (H₂) to the unsaturated bonds.

3. **Role of Catalyst**: In the hydrogenation process, a catalyst is required to facilitate the reaction. Nickel (Ni) is commonly used as a catalyst in this process.

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