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What is the change in oxidation number o...

What is the change in oxidation number of carbon in the following reaction?
`CH_4 (g) + 4Cl_2(g) rarr CCl_4(l) + 4HCl(g)

A

4 to 4

B

0 to 4

C

-4 to +4

D

0 to -4

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