Aqueous solution of which electrolyte produces H2 gas at cathode, when electrolysed among inert electrodes?
(1) NaCl
(2) MgCl2
(3) CuCl2
(4) AgCl
Correct option (1, 2)
Explanation:
H+ has lower discharge potential as compared to Na+ and Mg2+
Hence, in case of NaCl and MgCl2 reaction is 2H+ + 2e– →H2.
