Finely divided nickel and palladium are used for which of the following process?

Hydrogenation

Finely divided nickel and palladium are used in the process of (4) Hydrogenation.

Hydrogenation is a chemical process in which hydrogen gas (H₂) is added to unsaturated compounds (usually organic compounds containing double or triple bonds) in the presence of a catalyst. The catalysts commonly used for this process are finely divided nickel and palladium.

This process is widely used in various industries, such as food production (e.g., hydrogenation of vegetable oils to produce solid fats), petrochemicals, and pharmaceuticals.