Question

A compound ‘X’, used for whitewashing, when treated with chlorine gives compounds ‘Y’ along with water. Compound Y is used for bleaching action. Identify X and Y from the options given below.

• A. $X:Ca{\left(OH\right)}_{2;}Y:CaC{O}_3$
• B. $X:CaOC{l}_{2;}Y:CaC{O}_3$
• C. $X:Ca{\left(OH\right)}_2;Y:CaOC{l}_2$
• D. $X:CaC{O}_3;Y:Ca{\left(OH\right)}_2$

Answer 1

The correct option is C $X:Ca{\left(OH\right)}_2;Y:CaOC{l}_2$

• Since X is used for whitewashing, it is slaked lime.
• Y is used for bleaching action ,so it is none other than bleaching powder itself.
• When slaked lime is treated with chlorine, it gives bleaching powder along with water.
• $\underset{Slakedlime}{Ca{\left(OH\right)}_2}+\underset{Chlorine}{C{l}_2}\stackrel{{40}^{\circ }C}{\to }\underset{CalciumOxychloride}{CaOC{l}_2}+\underset{Water}{H_{2}O}$
• Therefore the correct answer is option C.