Consider the process,  $2\mathrm{Mg}\left(\mathrm{s}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right) \to \mathrm{MgO}\left(\mathrm{s}\right);$ A graph is drawn  between  ${∆}_{\mathrm{f}}^0\mathrm{G}$( y-axis) vs  $\mathrm{T} \mathrm{in} \mathrm{Kelvin}$( x-axis ) for this process. Nature of the graph is

$$\begin{gathered} ∆\mathrm{G}=∆\mathrm{H}-\mathrm{T}∆\mathrm{S}; ∆\mathrm{H} \mathrm{and} ∆\mathrm{S} \mathrm{remain} \mathrm{constant} \mathrm{with} \mathrm{T} \\ 2\mathrm{Mg}\left(\mathrm{s}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right) \to 2\mathrm{MgO}\left(\mathrm{s}\right), ∆\mathrm{S}=-\mathrm{ve}; \\ \mathrm{As} \mathrm{T} \mathrm{increases}, ∆\mathrm{G} \mathrm{increases}. \\ \mathrm{A} \mathrm{straight} \mathrm{line} \mathrm{with} \mathrm{positive} \mathrm{slope} \mathrm{is} \mathrm{observed} \end{gathered}$$