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]

The heat of transition \[(\Delta {{H}_{t}})\] of graphite into diamond

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

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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]

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