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The oxidation number of hyrogen is (i...

The oxidation number of hyrogen is
(i) `0`
(ii) ` +1`
(iii) ` -1`
(iv) `+ 1` only.

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(iii) `K^(o+)[Co(CO)_4]^(ɵ)`. Therefore, `x+0=-1orx=-1` Hence (iii) is the correct option.
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