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Question

Potash alum is an example of a:


A

Simple salt

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B

Complex salt

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C

Acid salt

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D

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 KAlSO4. So, the cations present in potash alum are K+ and Al+3.


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