In which of the following reaction does ...

In which of the following reaction does the heat change represent the heat of formation of water ?

A

`2H_(2(g))+O_(2(g))rarr2H_(2)O_((l)),DeltaH=116Kcal`

B

`H_(2(g))+(1)/(2)O_(2(g))rarrH_(2)O_((l)),DeltaH=-6.8Kcal`

C

`H_((aq))^(+)+OH_((aq))^(-)rarrH_(2)O_((l)),DeltaH=13.7Kcal`

D

`C_(2)H_(2(g))+2O_(2(g))rarr2CO_(2(g))+H_(2)O_((l)),DeltaH=310Kcal`

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The correct Answer is:

B

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