A. Cl2 is evolved at the cathode
B. H2 is evolved at cathode
C. Na is deposited at the cathode
D. Na appears at the nodes
Correct Answer: B. H2 is evolved at cathode
Detail about MCQs
Electrolysis of NaCl (sodium chloride) is a chemical process in which an electric current is passed through an aqueous (water-based) solution of sodium chloride. During this process, the compound NaCl is broken down into its constituent elements through redox reactions at the electrodes.
At the cathode (negative electrode), water (H2O) molecules are reduced by gaining electrons to form hydrogen gas (H2): 2H2O + 2e- -> H2(g) + 2OH-
At the anode (positive electrode), chloride ions (Cl-) are oxidized to form chlorine gas (Cl2): 2Cl- -> Cl2(g) + 2e-
So, electrolysis of NaCl in aqueous solution results in the production of hydrogen gas at the cathode and chlorine gas at the anode. This process is used in various industrial applications and plays a role in the production of chemicals like sodium hydroxide and chlorine gas.