Question

C. State whether the following statements are true or false. 1. Sea water is a good conductor of electricity. 2. A torch bulb can glow even with a weak current. 3. Iron and steel objects are coated with aluminium in various machine parts and for taps, etc. to make them look shinier. 4. Lemon juice and vinegar cannot be used as electrolytes as they do not conduct electricity 5. Electroplating metal objects with silver turns out to be very expensive.​

Answer 1

Answer:

1) true

2) false

3) false

4) false

5) true

Explanation:

1) saltwater is a good conductor of electricity which makes ocean water a resource for renewable energy

2) A torch bulb cannot be used to detect weak electric current flowing through a liquid in the circuit.

3) iron and steel objects are coated with zinc  in various machine parts and for taps, etc.

4) the bulb glows which shows that lemon juice and vinegar both conducts electricity, hence they are good conductors of electricity.

5) Electroplating produces a very thin coating of these expensive metals on the surfaces of cheaper metals, to give them the appearance and the chemical resistance of the expensive ones.

Answer 2

Answer:

1.True

2.False

3.False

4.False

5.True