If 3 moles of electrons are required to deposit 1 mole of a metal, \(M\) during the electrolysis of its molten chloride, the empirical formula of the metallic chloride is:

A. \(\mathrm{M}_{3} \mathrm{Cl} . \quad\)
B. \(\mathrm{M}_{3} \mathrm{Cl}_{4} \quad \mathrm{C}_{1}\)
C. \(\mathrm{M}_{2} \mathrm{Cl}\)
D. \( \mathrm{MCl}_{2}\)  

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Correct Answer: D