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Assertion : Sodium ions are discharged in preference to hydrogen ions at mercury electrode.

Reason : The nature of cathode can affect the order of discharge of cations.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false

1 Answer

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Best answer

Correct option (a) Both A and R are true and R is the correct explanation of A

Explanation:

Hydrogen ions are discharged in preference to sodium normally but at mercury electrode, sodium ions are discharged first due to the formation of amalgam (Na/Hg).

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