GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The method that cannot be used for removing permanent hardness of water is
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boiling
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distillation
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adding caustic soda
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adding sodium carbonate
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Explanation:
Detailed explanation-1: -The temporary hardness can be removed by boiling water. The permanent hardness of the water is due to the presence of soluble salts of magnesium and calcium which are present in the form of chloride and sulphides in water. So permanent hardness cannot be removed by boiling.
Detailed explanation-2: -Permanent Hardness of Water: When the soluble salts of magnesium and calcium are present in the form of chlorides and sulphides in water, we call it permanent hardness because this hardness cannot be removed by boiling. We can remove this hardness by treating the water with washing soda.
Detailed explanation-3: -Non-carbonate hardness is called ‘permanent’ hardness as it cannot be removed by boiling.
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