[CPMT 1986; CBSE PMT 1989; Roorkee 1990]
A) Bleaching powder
B) $ K_4[Fe{{(CN)}_6}] $
C) Hypo
D) Potash alum
Correct Answer: D
Potash alum $ K_2SO_4.Al_2{{(SO_4)}_3}.24H_2O $
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