$K_{2} {S O}_{4} . {A l}_{2} {({S O}_{4})}_{3} .24 H_{2} O$ and ${({N H}_{4})}_{2} {S O}_{4} . {A l}_{2} {({S O}_{4})}_{3} .24 H_{2} O$ are:

isotopes

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allotropes

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isomorphous

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isomers

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Solution

The correct option is C isomorphous
In crystallography, crystals are described as isomorphous if they are closely similar in shape. Isomorphous crystals belong to the same space group. Alums are double sulfate salts and they have similar shapes. Hence, $K_{2} {S O}_{4} . {A l}_{2} {({S O}_{4})}_{3} .24 H_{2} O$ and ${({N H}_{4})}_{2} {S O}_{4} . {A l}_{2} {({S O}_{4})}_{3} .24 H_{2} O$ are isomorphous.

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