question_answer

The heat of transition \[(\Delta {{H}_{t}})\] of graphite into diamond would be, where                 \[C(\text{graphite})+{{O}_{2}}(g)\to C{{O}_{2}}(g);\,\,\Delta H=x\,kJ\]                 \[C(\text{diamond})\,+{{C}_{2}}(g)\to C{{O}_{2}}(g);\,\,\Delta H=y\,kJ\]               [Pb. PET 1985]

A)                 \[(x+y)\,kJ\,mo{{l}^{-1}}\]          

B)                 \[(x-y)\,kJ\,mo{{l}^{-1}}\]

C)                 \[(y-x)\,kJ\,mo{{l}^{-1}}\]           

D)                 None of these