JEE CHEMISTRY MCQ: 13 TH GROUP ELEMENTS (P-BLOCK)

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Which of the following is called alum?

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Correct option: B

\mathrm{N}{\mathrm{a}_2}\mathrm{S}{\mathrm{O}_4}\cdot\mathrm{A}{\mathrm{l}_2}{\left( {\mathrm{S}{\mathrm{O}_4}} \right)_3} \cdot 24{\mathrm{H}_2}\mathrm{O}

Option B (

\mathrm{N}{\mathrm{a}_2}\mathrm{S}{\mathrm{O}_4}\cdot\mathrm{A}{\mathrm{l}_2}{\left( {\mathrm{S}{\mathrm{O}_4}} \right)_3} \cdot 24{\mathrm{H}_2}\mathrm{O}

) is correct because it matches the general formula of alum, which is a double sulfate salt with the formula

{M'_2}\mathrm{S}{\mathrm{O}_4} \cdot {M'''_2}{\left( {\mathrm{S}{\mathrm{O}_4}} \right)_3} \cdot 24{\mathrm{H}_2}\mathrm{O}

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