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(D) The tendency to form a metal oxide is related to the stability of the oxide formed and the reactivity of the metal. According to the Ellingham dia

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$Ca$

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(D) The tendency to form a metal oxide is related to the stability of the oxide formed and the reactivity of the metal. According to the Ellingham diagram,metals that are more reactive and have a more negative Gibbs free energy of formation $(\Delta G_f^\circ)$ for their oxides have a greater tendency to form oxides. Among the given metals ($Cr$,$Fe$,$Al$,$Ca$),$Ca$ is the most reactive alkaline earth metal. $Ca$ forms a highly stable ionic oxide $(CaO)$ with a very large negative value of $\Delta G_f^\circ$. Therefore,$Ca$ has the greatest tendency to form its oxide.

Which metal has a greater tendency to form metal oxide?

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