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Introduction to Oxidation and Reduction

When methane ...

Question

When methane is burnt in oxygen to produce $C O_{2}$ and $H_{2} O$ , the oxidation number changes by____________.

- 8

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0

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+ 8

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+ 4

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Solution

The correct option is C $+ 8$
$- 4 C H_{4} + 2 O_{2} \to + 4 C_{2} + 2 H_{2} O$ .
Oxidation number change $= + 4 - (- 4) = + 8$ .

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