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The chemical compound which is insoluble in water, formed when alum is added to water is _____________

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The chemical compound which is insoluble in water, formed when alum is added to water is _____________

(a) Al (OH)3

(b) CaSO4

(c) CO2

(d) Ca (OH)3

The question was posed to me in a national level competition.

Question is from Sedimentation with Coagulation topic in division Sedimentation of Environmental Engineering

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Right choice is (a) Al (OH)3

The explanation is: Al2 (SO4)3.18H2O + 3Ca (HCO3)2 = 2Al (OH)3 + 3CaSO4 + 18H2O + CO2

Where Al (OH)3  is insoluble in water.

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