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प्रश्न
Hard water contains dissolved salts of______ and _______.
पर्याय
sodium, potassium
sodium, magnesium
calcium, magnesium
calcium, potassium
MCQ
रिकाम्या जागा भरा
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उत्तर
Hard water contains dissolved salts of calcium and magnesium.
Explanation:
Hard water is water that contains high concentrations of Ca²⁺ and Mg²⁺ ions, typically in the form of their bicarbonates, sulphates, and chlorides (e.g., CaCO₃, MgSO₄, CaCl₂). These ions react with soap to form insoluble curdy precipitates (scum), which reduces soap's lathering ability and makes it ineffective for washing.
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