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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 ?

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85.
What do you understand by the term fuel cell?

A fuel cell is a device which converts the energy produced during the combustion of a fuel directly into electrical energy. Dihydrogen gas is used in H₂ – O₂ fuel cells for generating electrical energy. It should be noted that it has many advantages, for example, it does not produce any pollution and releases more amount of energy per unit mass of fuel as compared to gasoline and other fuels.

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