Magnesium and calcium ______________ cause temporary hardness of water ?
Correct answer: B. Bicarbonates
- A. Carbonates
- B. Bicarbonates
- C. Phosphates
- D. Sulphates
Explanation
Temporary hardness is caused by soluble calcium and magnesium bicarbonates, which decompose on boiling to form insoluble carbonates. Sulphates and other non-bicarbonate salts generally cause permanent hardness.
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