Q.

The formula of alum is

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a

FK2SO4.Al2SO43.24H2O

b

K4FeCN6

c

K2SO4.Al2SO43.6H2O

d

Na2CO3.10H2O

answer is A.

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Detailed Solution

General formula for alum isM2SO4.R2SO43.24H2OM = monovalent cation (K+, Na+ .… )R = Trivalent cation (Al+3, Fe+3)Hence, K2SO4.Al2SO43.24H2O represent an alum.
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