Bleaching of a fabric sloth is done using $A$ and excess of chlorine is removed using $B$ . $A$ and $B$ are:

C a O C l_{2}, N a_{2} S O_{3}

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N a_{2} S_{2} O_{3}, C a O C l_{2}

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C a C l_{2}, N a_{2} S_{2} O_{3}

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C a O C l_{2}, N a_{2} S_{2} O_{3}

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Solution

The correct option is B $C a O C l_{2}, N a_{2} S_{2} O_{3}$
Bleaching is done by $C a O C l_{2}$ and excess $C l_{2}$ is removed by thiosulphate as:
$C a C l_{2}$ + $H_{2} O$ $\to C a (O H)_{2} + C l_{2}$

$N a_{2} S_{2} O_{3} + C l_{2} + H_{2} O \to N a_{2} S O_{4} + H C l + H_{2} S O_{4}$

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Similar questions

C a O C l_{2}

$2 C a (O H)_{2} + 2 C l_{2} \to A - - + B - - + 2 H_{2} O$

A & B are

N a_{2} S_{4} - - - O_{6}, N a_{2} S_{2} - - - O_{3}, C a O C l_{2} - -- -, N_{2} - - - H_{4} O_{3}, F e_{3} - -- - O_{4}, K I_{3} - -, C r O_{5} - - -, K_{2} C r_{2} - -- - O_{7}

(C a O C l_{2})

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