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Question

A water sample is said to contain permanent hardness if water contains:

A
sulfates and chlorides of calcium and magnesium.
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B
carbonates of calcium and magnesium.
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C
bicarbonates of calcium and magnesium.
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D
sulfates and chlorides of sodium and potassium.
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Solution

The correct option is A sulfates and chlorides of calcium and magnesium.
Permanent hardness of water is due to sulfates and chlorides of calcium and magnesium. Temporary hardness of water is due to bicarbonates of calcium and magnesium.

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