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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