Which of the following is called Alum?

N a A l_{2} S i_{2} O_{8} . 6 H_{2} O

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F e S O_{4} . {(N H_{4})}_{2} S O_{4} .6 H_{2} O

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K C l - M g C l_{2} . 6 H_{2} O

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

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Solution

The correct option is D $N a_{2} S O_{4} . A l_{2} {(S O_{4})}_{3} .24 H_{2} O$
$N a_{2} S O_{4} . A l_{2} (S O_{4})_{3} .24 H_{2} O$ is called Alum. All alums have a general formula as $X_{2} S O_{4} . Y_{2} (S O_{4})_{3} .24 H_{2} O$ where X is a monovalent metal and Y is a trivalent metal.

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

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

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

K_{2} S O_{4} M n_{2} {(S O_{4})}_{3} .24 H_{2} O

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

F e

F e S O_{4}

(N H_{4})_{2} S O_{4}

6 H_{2} O

F e S O_{4}

F e S O_{4} . (N H_{4})_{2} S O_{4} .6 H_{2} O

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