Chemistry - Complete Pblock- Question with Solution | TestHub

General formula for alum is
${\mathrm{M}}_2\mathrm{S}{\mathrm{O}}_4.{\mathrm{R}}_2(\mathrm{S}{\mathrm{O}}_4{)}_3.24{\mathrm{H}}_2\mathrm{O}$
$\mathrm{M}=$monovalent cation$({\mathrm{K}}^{+},\mathrm{}\mathrm{}\mathrm{N}{\mathrm{a}}^{+}....)$
$\mathrm{R}=$Trivalent cation$(\mathrm{A}{\mathrm{l}}^{+3},\mathrm{}\mathrm{}\mathrm{F}{\mathrm{e}}^{+3})$
Hence,${\text{K}}_2{\text{SO}}_4\text{.}{\text{Al}}_2{({\text{SO}}_4)}_2.24{\text{H}}_2\text{O}$represent an alum.