Select the correct statenents :...

Select the correct statenents :

A

All combustion reactions are exothermic

B

heat of combustion are always exothermic

C

`N_(2) + O_(2) rarr 2NO , DeltaH=+ve`

D

`F_(2) +(1)/(2) O_(2) rarr F_(2)O , DeltaH =+ve`

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