Assertion :In electrolysis of aqueous $N a C l$ the product obtained is $H_{2}$ gas. Reason: Gases are liberated faster than the metals.

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
Electrolysis of aq. $N a C l$
$2 H_{2} O + 2 e^{-} ⟶ H_{2} + 2 O H^{⊝}$
$2 C l^{⊝} ⟶ C l_{2} + 2 e^{-}$
Hence, $H_{2}$ gas is evolved at cathode.
The reason for this is the preferential discharge theory.
It is not so that gases are liberated faster than metals.

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Assertion :In electrolysis of aqueous NaCl the product obtained is H2 gas. Reason: Gases are liberated faster than the metals.

The correct option is C Assertion is correct but Reason is incorrectElectrolysis of aq. NaCl2H2O+2e−⟶H2+2OH⊝2Cl⊝⟶Cl2+2e−Hence, H2 gas is evolved at cathode.The reason for this is the preferential discharge theory.It is not so that gases are liberated faster than metals.

Assertion :In electrolysis of aqueous $N a C l$ the product obtained is $H_{2}$ gas. Reason: Gases are liberated faster than the metals.