For the reactions,
$$\eqalign{
& 2C + {O_2} \to 2\,C{O_2},\,\,\,\,\,\,\,\,\,\Delta H = - 393\,J \cr
& 2Zn + {O_2} \to 2ZnO\,;\,\,\,\,\,\,\Delta H = - 412\,J \cr} $$
A.
carbon can oxidise $$Zn$$
B.
oxidation of carbon is not feasible
C.
oxidation of $$Zn$$ is not feasible
D.
$$Zn$$ can oxidise carbon.
Answer :
$$Zn$$ can oxidise carbon.
Solution :
$$\Delta H$$ negative shows that the reaction is spontaneous. Higher negative value for $$Zn$$ shows that the reaction is more feasible.
Releted MCQ Question on Physical Chemistry >> Chemical Thermodynamics
Releted Question 1
The difference between heats of reaction at constant pressure and constant volume for the reaction : $$2{C_6}{H_6}\left( l \right) + 15{O_{2\left( g \right)}} \to $$ $$12C{O_2}\left( g \right) + 6{H_2}O\left( l \right)$$ at $${25^ \circ }C$$ in $$kJ$$ is
$${\text{The}}\,\Delta H_f^0\,{\text{for}}\,C{O_2}\left( g \right),\,CO\left( g \right)\,$$ and $${H_2}O\left( g \right)$$ are $$-393.5,$$ $$-110.5$$ and $$ - 241.8\,kJ\,mo{l^{ - 1}}$$ respectively. The standard enthalpy change ( in $$kJ$$ ) for the reaction $$C{O_2}\left( g \right) + {H_2}\left( g \right) \to CO\left( g \right) + {H_2}O\left( g \right)\,{\text{is}}$$