- Take solutions of glucose, alcohol, hydrochloric acid, sulphuric acid, etc.
- Fix two nails on a cork, and place the cork in a 100 mL beaker.
- Connect the nails to the two terminals of a 6 volt battery through a bulb and a switch, as shown in Fig. 2.3.
- Now pour some dilute HCl in the beaker and switch on the current.
- Repeat with dilute sulphuric acid.
- What do you observe?
✅ Answer: In both cases, bulb glows. It means there is an electric current through the acidic solution by ions.
- Repeat the experiment separately with glucose and alcohol solutions. What do you observe now?
✅ Answer: Bulb does not glow because glucose & alcohol solutions do not conduct electricity.
- Does the bulb glow in all cases?
✅ Answer: No.