Question

Bleaching powder is obtained by treating chlorine with ________.

• A. ${\text{CaSO}}_4$
• B. $\text{CaO}$
• C. ${\text{CaCO}}_3$
• D. ${\text{Ca(OH)}}_2$

Answer 1

The correct option is D

${\text{Ca(OH)}}_2$

Explanation for correct option

(D)${\text{Ca(OH)}}_2$

Preparation of bleaching powder

• Bleaching powder is produced by the action of chlorine on dry slaked lime $\left[\mathrm{Ca}{\left(\mathrm{OH}\right)}_2\right]$.
• The reaction for the formation of bleaching powder is as follows:-
• $$\begin{gathered} {\text{Ca(OH)}}_{\text{2}}\left(\text{s}\right){\text{+Cl}}_{\text{2}}\left(\text{g}\right){\text{→ CaOCl}}_{\text{2}}\left(s\right){\text{+ H}}_{\text{2}}\text{O}\left(\text{l}\right) \\ \text{Calcium hydroxide Chlorine Calcium Hypochlorite} \end{gathered}$$

So, bleaching powder is obtained by treating chlorine with ${\text{Ca(OH)}}_2$.

Explanation for incorrect option

Bleaching powder is obtained by treating chlorine with ${\text{Ca(OH)}}_2$.Hence, options (A), (B), (D) are incorrect.

Hence, the correct option is (D). Bleaching powder is obtained by treating chlorine with ${\text{Ca(OH)}}_2$.