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Alum is the name used for all double salts having the composition \( \mathrm{M}_{2}{ }^{\prime} \mathrm{SO}_{4} \cdot \mathrm{M}_{2}{ }^{\text {III }}\left(\mathrm{SO}_{4}\right)_{3} \cdot 24 \mathrm{H}_{2} \mathrm{O} \). Where \( \mathrm{M}^{\text {III }} \) stands for \( \mathrm{Al}^{+3}, \mathrm{Cr}^{+3}, \mathrm{Fe}^{+3} \), while \( \mathrm{M}^{1} \) stands for:-
\( \mathrm{P} \)
(A) \( \mathrm{Li}^{+}, \mathrm{Cu}^{+}, \mathrm{Ag}^{+} \)
(B) \( \mathrm{Li}^{+}, \mathrm{NH}_{4}^{+}, \mathrm{Na}^{+} \)
(C) \( \mathrm{Na}^{+}, \mathrm{K}^{+}, \mathrm{Rb}^{+} \)
(D) \( \mathrm{Ca}^{+2}, \mathrm{Mg}^{+2}, \mathrm{Sr}^{+2} \)
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