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Question

Which of the following is not true?


A
Hardness of water depends on its behaviour towards soap
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B
The temporary hardness is due to the presence of Ca and Mg bicarbonates
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C
Permanent hardness is due to the presence of soluble Ca and Mg sulphates
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D
Permanent hardness can be removed by boiling the water
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Solution

The correct option is D Permanent hardness can be removed by boiling the water
Permanent hardness is the hardness that cannot be removed by boiling. It is usually caused by the presence of calcium sulphate or magnesium sulphates or chlorides, nitrates of Ca, Mg in the water which does not precipitate out as the temperature increases.

Hence, option D is correct.

Chemistry

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