A black powder when heated with conc. HCl gives a greenish yellow gas. The gas acts as an oxidizing and a bleaching agent. When it is passed over slaked lime, a white powder is formed which is a ready source of gas. The black powder and white powder respectively are:

K C l O_{3}

and

N a C l O_{3}

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M n O_{2}

and

C a (O C l)_{2}

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M n O_{2}

and

K C l O_{3}

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M n C l_{4}

and

C O C l_{2}

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Solution

The correct option is D $M n O_{2}$ and $C a (O C l)_{2}$
Bleaching agent is $C a (O C l)_{2}$ .
Black powder + $H C l$
$M n O_{2}$ $c o n c .$
$↓$
$C l_{2} + M n C l_{2} + H_{2} O$
greenish yellow
$↓$ $2 C a (O H)_{2}$
$C a (O C l)_{2} + H_{2} O + C a C l_{2}$
white powder

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

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