Question

When dry \[{\text{C}}{{\text{l}}_{\text{2}}}\] gas is passed over dry slaked lime, the product obtained is having the formula:
A.\[{\text{CaO}}\]
B.\[{\text{Ca}}{\left( {{\text{OCl}}} \right)_{\text{2}}}\]
C.\[{\text{CaOC}}{{\text{l}}_{\text{3}}}\]
D.\[{\text{CaC}}{{\text{l}}_{\text{2}}}{{\text{O}}_{\text{2}}}\]

Answer 1

Hint: The reaction of chlorine gas with slaked lime produces an industrially important product known as Bleaching powder under dry conditions. It has a wide range of industrial uses.

Complete step by step answer:
The chemical name for slaked lime is Calcium hydroxide which has the chemical formula,$Ca(OH)_2$. The chlorine gas (\[{\text{C}}{{\text{l}}_{\text{2}}}\]) is manufactured from the chlor-alkali process.
When dry chlorine gas is passed over the dry slaked lime, calcium oxychloride is formed. The common name of calcium oxychloride is Bleaching powder. It is also known as Calcium hypochlorite. The chemical formula of bleaching powder is \[{\text{Ca}}{\left( {{\text{OCl}}} \right)_{\text{2}}}\]. The oxidation of calcium in the bleaching powder is +2.
$ {\text{Ca(OH}}{{\text{)}}_{\text{2}}}{\text{ + C}}{{\text{l}}_{\text{2}}} \to {\text{ Ca}}{\left( {{\text{OCl}}} \right)_{\text{2}}} + {\text{ CaC}}{{\text{l}}_{\text{2}}} + {{\text{H}}_{\text{2}}}{\text{O}}$
The calcium dichloride formed is an inorganic chloride and calcium salt used to treat calcium channel blocker overdose, and beta-blocker overdose.
This is the industrially used synthesis procedure for bleaching powder. The major industrial uses of Bleaching powder are
-A strong oxidizer
-A popular disinfectant to make potable water
-Used to bleach wood pulp in paper industries

So, the correct option is B.

Note:
The whole reaction must be carried out in dry conditions to obtain bleaching powder. Since presence of moisture will lead to various other undesirable products. The uses of the major product, Calcium hypochlorite and the by-product, Calcium dichloride is numerous in both the medical field and industrial field of research.