Potash alum is represented by the formula :

K_{2} S O_{4} \cdot A l_{2} (S O_{4})_{3} \cdot 24 H_{2} O

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K \cdot A l (S O_{4})_{2} \cdot 12 H_{2} O

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Both (a) and (b)

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None of these

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Solution

The correct option is D $K \cdot A l (S O_{4})_{2} \cdot 12 H_{2} O$
Potassium alum or potassium aluminium sulphate is a chemical compound with a chemical formula $K A l (S O_{4})_{2}$ and it is commonly found in its dodecahydrate form as $K A l (S O_{4})_{2} .12 H_{2} O$ .

Alum is the common name for this chemical compound.

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K A l (S O_{4})_{x}, 12 H_{2} O

K A l (S O_{4})_{x}, 12 H_{2} O

(K_{2} S O_{4} \cdot C r_{2} (S O)_{4})_{3} \cdot 24 H_{2} O

K A l (S O_{4})_{2} \cdot 12 H_{2} O

K_{2} S O_{4}

A l_{2} (S O_{4})_{3}

S O_{4}^{- 2}

1.25

K_{2} S O_{4} \cdot A l_{2} (S O_{4})_{3} \cdot 24 H_{2} O

1

N_{A}

= K_{2} S O_{4} . A l_{2} (S O_{4})_{3} . 24 H_{2} O

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