Chemically, potash alum is

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$K_{2} {SO}_{4} \cdot {Al}_{2} {({SO}_{4})}_{3} \cdot 6 H_{2} O$

$K_{2} {SO}_{4} \cdot {Al}_{2} {({SO}_{4})}_{3} \cdot 18 H_{2} O$

$K_{2} {SO}_{4} \cdot {Al}_{2} {({SO}_{4})}_{3} \cdot 24 H_{2} O$

$K_{2} {SO}_{4} \cdot {Al}_{2} {({SO}_{4})}_{3} \cdot 12 H_{2} O$

answer is D.

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Detailed Solution

A chemical substance with the name potassium alum, sometimes known as potash alum or potassium aluminium sulphate, has the formula $KAl {({SO}_{4})}_{2}$ . It is frequently found as $KAl {({SO}_{4})}_{2} \cdot 12 H 2 O$ , a dodecahydrate.

$K_{2} {SO}_{4} \cdot {Al}_{2} {({SO}_{4})}_{3} \cdot 24 H_{2} O$ is the correct answer

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