Which of the following compounds can make clothes fire proof?

F e S O_{4}

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

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C u_{2} S O_{4}

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F e S O_{4} \cdot 7 H_{2} O

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Solution

The correct option is A $A l_{2} (S O_{4})_{3}$
Aluminium sulfate is used in construction industry as waterproofing agent and produces a gelatinous precipitate of aluminium hydroxide helping the dye adhere to clothing fiber and used as water proof agent as the pigment is insoluble.

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