Chlorine is prepared on a large scale by the
-
A.
electrolysis of concentrated sodium chloride solution -
B.
action of manganese (IV) oxide on hot concentrated hydrochloric acid -
C.
action of concentrated tetraoxosulphate (IV) acid on sodium chloride -
D.
oxidation of concentrated hydrochloric acid with potassium tetraxosulphate (VII) -
E.
action of dilute mineral acids on bleaching powder