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Complete the following reactions:

$bold CO bold left parenthesis bold g bold right parenthesis bold space bold plus bold space bold H subscript bold 2 bold left parenthesis bold g bold right parenthesis bold space bold space bold rightwards arrow from bold Catalyst to bold increment of$

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82.

Complete the following reactions:

$CuO left parenthesis straight s right parenthesis space plus space straight H subscript 2 left parenthesis straight g right parenthesis space space rightwards arrow$

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83. Comment on the reactions of dihydrogen with: (i) chlorine (ii) sodium and (iii) copper (II) oxide.

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84.
What do you understand by hydrogenation of oils or hardening of oils ?

Hydrogenation means the addition of hydrogen across double and triple bonds to form saturated compounds.
Hydrogenation is used for the conversion of polyunsaturated oils into edible fats. When dihydrogen under pressure is bubbled through vegetable oils (contain many C = C bonds) in the presence of finely divided nickel at about 400K, they are converted into solid fats. The product formed is called vanaspati ghee (hydrogenated vegetable oil).

The above reaction is known as hardening of oils.