Bleaching powder reacts with a few drops of conc.`HCl` to yield

Options

A. oxygen
B. calcium oxide
C. hypochlorous acid
D. chlorine

Answer

4

Explanation

Bleaching power loses its chlorine by the action of dilute acids (in excess) or carbon dioxide:
`Ca(OCl)_(2)+HClrarrCaCl_(2)+H_(2)O+Cl_(2)`
` Ca(OCl)_(2)+H_(2)SO_(4)rarrCaSO_(4)+H_(2)O+Cl_(2)`
`Ca(OCl)_(2)+CO_(2)rarrCaCO_(3)+Cl_(2)`
The amount of chlorine obtained from a sample of bleaching powered by treatment with excess of dilute acids or carbon dioxide is called available chlorine.
A good sample of bleaching power contains `35-38%` of available chloride.