Answer:
(c) Heat of formation of
a compound may be positive or negative, e.g.,
\[C(s)+{{O}_{2}}(g)\to
C{{O}_{2}}(g);\,\,\,\,\Delta H{}^\circ =-393.5kJ\,mo{{l}^{-1}}\]\[{{N}_{2}}(g)+\frac{1}{2}{{O}_{2}}(g)\to
{{N}_{2}}O(g);\,\,\,\Delta {{H}^{{}^\circ }}=+92kJ\,mo{{l}^{-1}}\]
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