Q33 / 180 · KCET 2018 · Chemistry

Which of the following ions will cause hardness in water?

  • Correct answer
    A
    \( \mathrm{Ca}^{2+} \)
  • B
    \( \mathrm{Na}^{+} \)
  • C
    \( \mathrm{Cl}^{-} \)
  • D
    \( \mathrm{K}^{+} \)

Solution

Presence of calcium and magnesium salts of hydrogen carbonates, chlorides and sulphates makes water Hard

Hence, the correct answer is option: 'A'.

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