Explain the use of hydrogen in the formation of vegetable fats.

Explanation

Hydrogen is employed for the conversion of polyunsaturated vegetable oils like soyabean, cotton seeds into vegetable fats like daida, gagan etc.
`underset("Liquid")("Vegetable oil") + H_2 underset(473K)overset(Ni)to underset("Solid")("Fat")`
The reaction occurs in the presence of nickel catalyst and at a temperature of 473 K.