In carbonate hardness cations are ans. Mg2+ Ca2+ Na+ Both Ca2+ & Mg2+
Question
In carbonate hardness cations are ans. Mg2+
Ca2+
Na+
Both Ca2+ & Mg2+
Solution
The hardness of carbonate is primarily due to the presence of calcium (Ca2+) and magnesium (Mg2+) cations. Sodium (Na+) does not contribute to hardness. Therefore, the answer is "Both Ca2+ & Mg2+".
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