Assertion :Chlorine gas disproportionate in hot & conc. NaOH solution Reason: NaCl and NaOCl are formed in the above reaction.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
When passed into cold dilute solution of alkalies, it forms chloride and hypochlorites
$2 N a O H + C l_{2} \to N a C l + N a C l O + H_{2} O$
$2 C a (O H)_{2} + 2 C l_{2} \to C a C l_{2} + C a (C l O)_{2} + 2 H_{2} O$
However with hot concentrated alkali solutions it forms chlorates.
$6 N a O H + 3 C l_{2} \to 5 N a C l + N a C l O_{3} + 3 H_{2} O$
$6 C a (O H)_{2} + 6 C l_{2} \to 5 C a C l_{2} + C a (C l O_{3})_{2} + 6 H_{2} O$

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Lithium sulphate does not form alums.

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