Question

Assertion : Electrolysis of NaCl_(aq) produces Na metal.

Reason: Na+ is obtained at cathode.

(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

Answer 1

Option (d) is correct

Explanation

Discharge potential of Na+ is greater than H⁺ ion . So H⁺ ion is preferably discharged at cathode,  liberating H₂(g). Again Cl- concentration  in brine solution being high Cl^- ion is discharged at anode , liberating Cl₂(g). Thus concentration of Na+ and OH- in water will become high. So the solution will be treated as a mixture NaCl and NaOH in water.

Answer 2

Correct option (d) A and R are false

Explanation:

 Electrolysis of brine solution NaCl_(aq)

produces NaOH, H₂ and Cl₂.

Hydrogen gas is obtained at cathode.