Potash alum is an example of a:

Simple salt

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Complex salt

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Acid salt

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Double salt

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Solution

The correct option is D
Double salt

Potash alum is potassium double sulphate of aluminium, i.e. a double salt as it contains more than one cation. Its formula is $K A l S O_{4}$ . So, the cations present in potash alum are $K^{+}$ and $A l^{+ 3}$ .

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