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Which gas is released when alum is added to water?

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+1 vote
in Environmental Engineering by (81.4k points)
Which gas is released when alum is added to water?

(a) Al (OH)3

(b) CaSO4

(c) CO2

(d) Ca (OH)3

The question was asked in a national level competition.

Origin of the question is Sedimentation with Coagulation topic in section Sedimentation of Environmental Engineering

1 Answer

+2 votes
by (693k points)
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Best answer
The correct answer is (c) CO2

Easiest explanation: Carbon dioxide gas is released when alum is added to water, which is corrosive to metals.

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