NaOCl is used...

Question

$N a O C l$ is used as a bleaching agent and sterilising agent. It can be prepared by the action of:

N a C l

with

H_{2} O

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N H_{4} C l

with

N a O H

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C l_{2}

with cold and dil.

N a O H

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C l_{2}

with hot and conc.

N a O H

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Solution

The correct option is C $C l_{2}$ with cold and dil. $N a O H$
Chlorine with cold and dilute sodium hydroxide give mixture of chloride salt, hypochlorite and water.

$C l_{2} (l) + 2 N a O H (a q) \to N a C l + N a C l O (a q) + H_{2} O (l)$

Chlorine with hot and dilute sodium hydroxide give mixture of chloride salt, hypochlorite and water.

$3 C l_{2} (l) + 6 N a O H (a q) \to 5 N a C l + N a C l O_{3} (a q) + 3 H_{2} O (l)$

Hence, the correct option is $C$

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Balance

NaCl + H2O =NaOH + H2O + Cl2

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