I. Bleching powder is used in the preparation of chloroform.
II. Bleaching powder decomposes in the presence of $CoCL_2$ to liberate $O_2$
III. Aqueous $KHF_2$ is used in the preparation of fluorine.
The correct combiantion is :
(a) I,II and III are correct
(b) Only II is correct
(c) Only I and III are correct
(d) Only I and II are correct
