Q.

Which of the following general formulae represent alum ?

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a

M2CO3. M2SO43.12H2O

b

M2SO4. SO43.12H2O

c

M2SO4. SO42.12H2O

d

M2SO4. M'2SO43.24H2O

answer is D.

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Detailed Solution

Alum is a hydrated sulphate of monovalent and trivalent metal.
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