Water is said to be permanently hard when it contains:
Correct answer: D. chlorides of Ca2+ and Mg2+ ions
- A. carbonates of Ca2+ and Mg2+ ions
- B. Bicarbonates of Ca2+ and Mg2+ ions
- C. sulphates of Na+ and Mg2+ ions
- D. chlorides of Ca2+ and Mg2+ ions
Explanation
The presence of soluble salts of calcium and magnesium, i.e., sulfates and chlorides of calcium and magnesium, causes permanent hardness in the water.
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