Potash alum is 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 $K A l (S O_{4})_{2}$ .

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Similar questions

Column A	Column B
1. Acid salt 2. Mixed salt 3. Complex salt 4. Double salt 5. Normal salt	(a) Sodium potassium carbonate (b) Alum (c) Sodium carbonate (d) Sodium zincate (e) Sodium hydrogen carbonate

Name :

(a) a chloride which is insoluble in cold water but dissolves in hot water,

(b) a chloride which is insoluble,

(d) a basic salt,

(e) an acidic salt,

(f) a mixed salt,

(g) a complex salt,

(h) a double salt,

(i) a salt whose solubility increases with temperature,

(j) a salt whose solubility decreases with temperature.

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