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a
Alum
b
Chrome alum
c
Microcosmic salt
d
All of these
answer is D.
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Detailed Solution
All compounds that dissociate into two or more cations/anions completely on dissolving into water are known as double salts.(1) General formula of alums:A2SO4⋅B2SO43⋅24H2O where A is monovalent radical while B is trivalent radicals.