Hardness of water is due to the presence of dissolved metal ions, primarily Ca²⁺ and Mg²⁺. Temporary hardness can be removed by boiling, while permanent hardness requires other methods like ion exchange or chemical precipitation.
Consider the following statements about the hardness of water :
Asked in KPSC KAS Prelims 2015 · Topic: Physical and Chemical Changes, Solution (Definition and Characteristics of Chemical Changes (Chemical Reactions))
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Answer: B. Permanent hardness is caused by the presence of dissolved calcium sulphate/ calcium chloride and/or magnesium sulphate/magnesium chloride.
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