Easy MCQ +4 / -1 PYQ · JEE Mains 2022

The products obtained during treatment of hard water using Clark's method are :

  1. A $\mathrm{CaCO}_{3}$ and $\mathrm{MgCO}_{3}$
  2. B $\mathrm{Ca}(\mathrm{OH})_{2}$ and $\mathrm{Mg}(\mathrm{OH})_{2}$
  3. C $\mathrm{CaCO}_{3}$ and $\mathrm{Mg}(\mathrm{OH})_{2}$ Correct answer
  4. D $\mathrm{Ca}(\mathrm{OH})_{2}$ and $\mathrm{MgCO}_{3}$

Solution

In Clark's method lime water is used<br/><br/> $$ \begin{aligned} &\mathrm{Ca}\left(\mathrm{HCO}_3\right)_2+2 \mathrm{Ca}(\mathrm{OH})_2 \rightarrow 2 \mathrm{CaCO}_3+2 \mathrm{H}_2 \mathrm{O} \\\\ &\mathrm{Mg}\left(\mathrm{HCO}_3\right)_2+2 \mathrm{Ca}(\mathrm{OH})_2 \rightarrow 2 \mathrm{CaCO}_3+\mathrm{Mg}(\mathrm{OH})_2+2 \mathrm{H}_2 \mathrm{O} \end{aligned} $$

About this question

Subject: Chemistry · Chapter: p-Block Elements · Topic: Group 13: Boron Family

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