Question

Four half reactions I to IV are shown below : I. 2Cl⁻ → Cl₂ + 2e⁻, II. 4OH⁻ → O₂ + 2H₂O + 2e⁻, III. Na⁺ + e⁻ → Na, IV. 2H⁺ + 2e⁻ → H₂. Which two of these reactions are most likely to occur when concentrated brine is electrolysed ?

Answer the following questions on the basis of the given figure:

Choose the correct answers to the questions from the given options. (Do not copy the questions, write the correct answers only.)

A student was instructed by the teacher to prepare and collect ammonia gas in the laboratory by using aluminium nitride. The student had set up the apparatus as shown in the diagram below. Study the given diagram and answer the following questions: