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Question

NaOCl is used as a bleaching agent and sterilising agent. It can be prepared by the action of:

A
NaCl with H2O
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B
NH4Cl with NaOH
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C
Cl2 with cold and dil. NaOH
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D
Cl2 with hot and conc. NaOH
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Solution

The correct option is C Cl2 with cold and dil. NaOH
Chlorine with cold and dilute sodium hydroxide give mixture of chloride salt, hypochlorite and water.

Cl2(l)+2NaOH(aq)NaCl+NaClO(aq)+H2O(l)

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

3Cl2(l)+6NaOH(aq)5NaCl+NaClO3(aq)+3H2O(l)

Hence, the correct option is C

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