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Which of the following causes the temporary hardness?

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+1 vote
in Environmental Engineering by (81.4k points)
Which of the following causes the temporary hardness?

(a) CaSO4

(b) MgSO4

(c) MgCl2

(d) Ca (HCO3) 2

I had been asked this question at a job interview.

The question is from Types of Hardness and Method of their Removal topic in portion Water Softening of Environmental Engineering

1 Answer

+2 votes
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Best answer
Right option is (d) Ca (HCO3) 2

Easy explanation: As the temporary hardness is caused due to the presence of carbonate and bicarbonates, therefore Ca (HCO3) 2 cause temporary hardness.

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