39th B.P.S.C. (Pre) 1994
What is untrue for bleaching powder?
aIt is more soluble in water✓ Correct
bIt is powder of light yellow colour
cIt is an oxidant
dIt releases chlorine after reaction with dilute acid
Explanation
Bleaching powder is a pale yellowish-white powder having the smell of chlorine. When bleaching powder is left open in air, chlorine gas slowly escapes from it. It reacts with carbon dioxide or dilute sulphuric acid or dilute hydrochloric acid to liberate chlorine gas. $CaOCl_2 + CO_2 \rightarrow CaCO_3 + Cl_2$ $CaOCl_2 + 2HCl \rightarrow CaCl_2 + H_2O + Cl_2$ $CaOCl_2 + H_2SO_4 \rightarrow CaSO_4 + H_2O + Cl_2$
general-science