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The heat of combustion of CH(4)(g), C(gr...

The heat of combustion of `CH_(4)(g)`, C(graphite) and `H_(2)(g)` are - 20 Kcal, - 40 Kcal and -10 Kcal respectively. The heat of formation of methane is

A

`-40` Kcal

B

`+40` Kcal

C

`-80` Kcal

D

`+80` Kcal

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The correct Answer is:
A
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