Which of the following ions will cause hardenss in water sample?
A
Ca2+
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B
Na+
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C
Cl−
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D
K+
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Solution
The correct option is ACa2+ The ions which cause hardness to water are Ca2+ and Mg2+. They form salts with HCO−3,Cl−,SO−4 ions which when found dissolved in water, cause the hardness of the water.