Question

Bleaching powder contains a salt of an oxoacid as one of its components. The anhydride of that oxoacid is …….
A. $C{{l}_{2}}O$
B. $C{{l}_{2}}{{O}_{7}}$
C. $Cl{{O}_{2}}$
D. $C{{l}_{2}}{{O}_{6}}$

Answer 1

Hint: Chemical name of bleaching powder is calcium hypochlorite and it is formed by the reaction between the hydrochloric acid and sodium chloride. It exists as an important raw material for the production of various chemical compounds like caustic soda, bleaching powder etc.

Complete answer: Bleaching powder is a pale yellowish powder having a strong smell of chlorine. It is soluble in water but due to the impurities present in it and it will never find a clear solution. Chemical formula of bleaching powder is $CaOC{{l}_{2}}$. If an acid contains oxygen then it is termed as oxoacid.
-Bleaching is used as a bleaching agent for dirty clothes, disinfection of water and also used as a strong oxidizing agent. The amount of Cl present in the powder is measured by iodometry. Bleaching powder is represented by $CaOC{{l}_{2}}$ which can also be written as $Ca(OCl)Cl$ where $OC{{l}^{-}}$ is hypochlorite ion which is the anion of $HOCl$ and it is referred as oxoacid of bleaching powder. If we remove water molecule that is not a favorable case so the equation should be like:
$2HOCl-{{H}_{2}}O=C{{l}_{2}}O$
-Hence from the above discussion we can conclude that bleaching powder contains a salt of an oxoacid i.e $HOCl$ as one of its component and the anhydride of that oxoacid is $C{{l}_{2}}O$.

Option A is the correct answer.

Note: Bleaching powder is generally basic in character. When bleaching powder reacts with hydrochloric acid it gives calcium chloride, chlorine and water as products. Oxoacid are those which essentially have X-OH bonds and also X=O bonds.