Q78 / 160 · JIPMER 2006 · Chemistry

Hardness of water is due to presence of salts of :

  • A
    $\mathrm{Na}^{+}$and $\mathrm{K}^{+}$
  • Correct answer
    B
    $\mathrm{Ca}^{2+}$ and $\mathrm{Mg}^{2+}$
  • C
    $\mathrm{Ca}^{2+}$ and $\mathrm{K}^{+}$
  • D
    $\mathrm{Ca}^{2+}$ and $\mathrm{Na}^{+}$

Solution

Hardness of $\mathrm{H}_2 \mathrm{O}$ is due to the presence of bicarbonates, chlorides, and sulphates of Ca and Mg ions.

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

More Hydrogen Questions