Question

Which of the following observations can be made when the switch is closed in the given circuit?

• A. Electrical energy is converted into chemical energy.
• B. Current is passed from copper rod to zinc rod.
• C. Copper electrodes begin to dissolve in the sulphuric acid.
• D. Bubbles are formed on the zinc rod.

Answer 1

The correct option is B Current is passed from copper rod to zinc rod.

When the switch is closed, the given circuit will act like a cell.

• Here, copper rod and zinc rod are used as electrodes and dilute sulphuric acid is used as an electrolyte.
• These two metals undergo chemical reactions, and the current starts to flow from copper rod to zinc rod.
• Because of the flow of current, the LED will start glowing.
• In this cell, chemical energy is getting converted into electrical energy.
• When zinc and copper rods are immersed in dilute sulphuric acid, zinc slowly dissolves in sulphuric acid, and bubbles are formed on the copper rod.