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Question
Assertion: Electrolysis of NaCl solution gives chlorine at anode instead of O2.
Reason: Formation of oxygen at anode requires overvoltage.
Options
Both assertion and reason are true and the reason is the correct explanation of assertion.
Both assertion and reason are true and the reason is not the correct explanation of assertion.
Assertion is true but the reason is false.
Both assertion and reason are false.
Assertion is false but reason is true.
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Solution
Both assertion and reason are true and the reason is the correct explanation of assertion.
Explanation:
At the anode, the following oxidation reactions are possible.
\[\ce{Cl^{-} (aq) -> 1/2 Cl_{2}(g) + e^{-}; E = 1.36V}\]
\[\ce{2H2O(l) -> O2(g) + 4H^{-} (aq) + 4e^{-}; E = 1.23V}\]
Lower value of Ecell is perferenced but due to overvolatage chlorine is liberated at anode.
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