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For Which of the reaction below is (are)...

For Which of the reaction below is (are) the heat of reaction euqal to the heat of formation ?
`(p)(1)/(2)N_(2)(g)+O_(2)(g)to NO_(2)(g) DeltaHgt0`
`(Q)SO_(2)(g)+(1)/(2)O_(2)(g)to SO_(3)(g) DeltaHlt 0`

A

P only

B

Q only

C

Both p and Q

D

Neither P nor Q

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The correct Answer is:
a
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