Question

Based on the reactions given below, answer the following questions. 

i. Aqueous solution of CuCl₂ undergoes electrolysis using graphite rods. 

ii. Molten KCl undergoes electrolysis. 

iii. Aqueous solution of NaCI undergoes electrolysis. 

a. In which all reactions Cl₂ gas is formed? At which electrode is Cl₂ gas formed? 

b. In which reaction H₂ gas is formed? Write the chemical equation of this reaction.

Answer 1

a. Cl₂ gas is formed in all the three reactions. Chlorine gas is formed at anode. 

b. When aqueous solution of NaCI undergoes electrolysis, hydrogen gas is formed at cathode.

Equation: 2H₂O + 2e^- → H₂ + 2OH^-