Question

Bleaching powder is prepared by passing _______ gas over dry slaked lime.

• A. hydrogen
• B. nitrogen
• C. oxygen
• D. chlorine

Answer 1

The correct option is D chlorine

Bleaching powder $Ca(OCl{)}_2$ is formed by passing chlorine gas over dry slaked lime at 400 $°\mathrm{C.}$

$2Ca\left(OH{)}_2\right(l)+2C{l}_2(g)\to Ca(OCl{)}_2\left(s\right)+2H_{2}O\left(l\right)+Ca\left(Cl{)}_2\right(aq)$