Question

yellow powder X gives a pungent smell if Left Open in air. it is prepared by the reaction of dry compound Y with chlorine gas. it is used for disinfecting drinking water. identify X and Y and write the reaction involved.

Answer 1

X is bleaching powder
Y is clacium hydroxide
When y reacts with chlorine it forms calcium.oxy chloride which is bleaching powdér
CA (OH)2+CL2---- CAOCL2+H2O

Answer 2

X is bleaching powder.

Y is calcium hydroxide.

Explanation:

X must be bleaching powder with chemical formula $CaOCl_2$ as it is used for disinfecting drinking water and also a yellow powder.

It can be prepared by the reaction of $Ca(OH)_2$ with $Cl_2$ hence Y (dry compound) must be $Ca(OH)_2$ that calcium hydroxide. When calcium hydroxide reacts with chlorine gas it forms bleaching powder and water.

The reaction can be written as:

$\mathrm{Ca}(\mathrm{OH})_{2}+\mathrm{Cl}_{2} \rightarrow \mathrm{CaOCl}_{2}+\mathrm{H}_{2} \mathrm{O}$