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The two ions responsible for hardness in water are
...

The two ions responsible for hardness in water are

A.

Ca $^{2+}$ and / or Mg $^{2+}$

B.

K $^+$ and / or Mg $^{2+}$

C.

Ca $^{2+}$ and / or Li $^+$

D.

Ca $^{2+}$ and / or Na $^+$

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Correct answer is A

No explanation has been provided for this answer.

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