Temporary hard water is formed when rain was containing dissolved carbon (IV) oxide flows over deposit of

Kingsley Thompson January 16, 2026

Temporary hard water is formed when rain was containing dissolved carbon (IV) oxide flows over deposit of

A. CaCO3

B. Na2CO2

C. Na2SO4

D. CaSO4

Temporary hardness of water is caused by the presence of calcium hydrogencarbonate, which forms when rainwater containing dissolved carbon(IV) oxide (CO₂) flows over calcium carbonate deposits.

Reaction:
CaCO3 + CO2 + H2O 一> Ca(HCO3)2

So, the correct option is:

✅ A. CaCO₃

PQN:40
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Kingsley Thompson

Posted by: Kingsley Thompson

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