question_answer

\[C+{{O}_{2}}\to C{{O}_{2}};\,\Delta H=X\]                 \[CO+\frac{1}{2}{{O}_{2}}\to C{{O}_{2}};\,\Delta H=Y\]                 Then the heat of formation of \[CO\] is [BHU 1997; DPMT 2002]

A)                 \[X-Y\]

B)                 \[Y-2X\]

C)                 \[X+Y\]                

D)                 \[2X-Y\]