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Introduction to Oxidation and Reduction

On combustion...

Question

On combustion of $C H_{4}$ to $C O_{2}$ and $H_{2}$ , the oxidation number of carbon changes by :

A

8

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B

3

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C

0

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D

4

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Solution

The correct option is B 8
Reaction:
$C H_{4} + O_{2} \to C O_{2} + 2 H_{2}$
-4 +4
Oxidation number of C changes by $4 - (- 4) = 8$ .

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