Hydrogeneration of oils (manufacture of vegetable ghee) is carried out in the presence of………..(name of catalyst).

Answer

**Step-by-Step Solution:**

1. **Understanding Hydrogenation**: Hydrogenation is a chemical reaction that involves the addition of hydrogen (H₂) to unsaturated compounds, such as vegetable oils, which contain double or triple carbon-carbon bonds.

2. **Purpose of Hydrogenation**: The primary purpose of hydrogenating vegetable oils is to convert them into a more saturated form, which is solid at room temperature, such as vanaspati ghee. This process reduces the number of double bonds, resulting in a product that has only single carbon-carbon bonds.

3. **Identifying the Catalyst**: In chemical reactions, a catalyst is a substance that increases the rate of a reaction without being consumed in the process. For the hydrogenation of vegetable oils, specific catalysts are used to facilitate the reaction.

4. **Common Catalysts for Hydrogenation**: The most commonly used catalysts for the hydrogenation of oils include metals such as nickel (Ni), palladium (Pd), and platinum (Pt). Among these, nickel is the most widely used due to its effectiveness and cost efficiency.

5. **Conclusion**: Therefore, the catalyst used in the hydrogenation of oils (manufacture of vegetable ghee) is nickel.

**Final Answer**: Nickel (Ni)

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