1.

Which of the following reaction can be used to define the heat of formation of \[C{{O}_{2}}(g)\] [MP PMT 1989; MH CET 2001]

A.                 \[C\text{(graphite)}+{{O}_{2}}(g)=C{{O}_{2}}(g)\]
B.                 \[C{{H}_{4}}(g)+2{{O}_{2}}(g)=C{{O}_{2}}(g)+2{{H}_{2}}O(l)\]
C.                 \[CO(g)+\frac{1}{2}{{O}_{2}}(g)=C{{O}_{2}}(g)\]
D.                 \[{{C}_{6}}{{H}_{6}}(l)+7\frac{1}{2}{{O}_{2}}(g)=6C{{O}_{2}}+3{{H}_{2}}O(l)\]
Answer» B.                 \[C{{H}_{4}}(g)+2{{O}_{2}}(g)=C{{O}_{2}}(g)+2{{H}_{2}}O(l)\]


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