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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?

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86. Complete the following equations:

CO left parenthesis straight g right parenthesis space plus space straight H subscript 2 left parenthesis straight g right parenthesis space rightwards arrow from catalyst to increment of or CO left parenthesis straight g right parenthesis space plus space straight H subscript 2 space rightwards arrow from 700 straight K comma space 200 space atm to ZnO divided by Cr subscript 2 straight O subscript 3 of ?

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87. Complete the following equations:

HC identical to CH space plus space straight H subscript 2 space rightwards arrow from Heat to Ni of space ?

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88. Complete the following equations:

Zn space plus space NaOH space space rightwards arrow space ?

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89.
Why does elemental hydrogen react with other substances only slowly at room temperature?

Dihydrogen has higher bond dissociation energy (436 kJ mol^-1). Therefore, it does not react easily with other elements or substances at room temperature.

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