Question

Assertion :Alkali metals cannot be prepared by electrolysis of their chlorides in aqueous solution. Reason: Reduction potentials of alkali metal cations is much lower than that of $H^{+}.$

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Alkali metals can not be prepared by electrolysis of the aqueous solution of their salts since hydrogen is liberated at the cathode instead of the alkali metal because the discharge potentials of alkali metals are much higher than that of the hydrogen. (or Reduction potentials of alkali metal cations is much lower than that of $H^{+}$)
Reaction at cathode:

$2H^{+}\left(aq\right)+2e^{-}\to H_2$
Reaction at anode:

$2C{l}^{-}\left(aq\right)\to C{l}_2+2e^{-}$

Option A is correct.