1. In LEDs, the longer lead (wire) is always connected to the _______ terminal:

2. Tap water is a good conductor of electricity while distilled water is not because:

3. When electrodes are immersed in water and electricity passed, the bubbles formed on the positive terminal is actually _______ gas.:

4. When electrodes are immersed in water and electricity passed, the bubbles formed on the negative terminal is actually _______ gas.:

5. Why do we add little dilute sulphuric acid to copper sulphate solution during electroplating?:

6. A coating of _________is deposited on iron to protect it from corrosion and formation of rust:

7. Chromium plating is done on many objects such as car parts, bath taps, kitchen gas stove etc. Why?:

8. The process of depositing a layer of any desired metal on another material by means of electricity is called ___________.:

9. Some liquids are good conductors of electricity and some are poor conductors. Which one is a poor conductor?:

10. Tin cans, used for storing food, are made by electroplating tin onto iron. Why?: