CHEMICAL EFFECTS OF ELECTRIC CURRENT (VIII)

Poor conductor of electricity

• Lemonade

• Sea water

• Glucose

• Mineral water

The process of depositing a layer of desired metal on another metal

• Electrolysis

• Electroplating

• Electrophoresis

• Electrogram

Which of the following are applications of electroplating?

• Chromium plating in automobiles

• Zinc plating (galvanization)

• Gold plated jewellery

• All of the above

In the process of electroplating, pure copper rod is connected to _________ terminal of the battery.

• Positive

• Negative

• Neutral

• None of the above

Which of the following chemical effects are observed while electrolysis?

• Discharge of gas bubbles

• Discoloration of electrolyte (solution)

• Deposition of metal on electrode

• All of the above

Daniel wanted to gift a silver plated spoon to his mother. He used the technique of electroplating for this purpose. Which end of the battery should the spoon be connected to ?

• Positive

• Negative

• Doesn't matter

• None of the above

The bulb doesn't glow in the setup shown above. Suggest suitable solution to check whether the circuit is complete or not.

• Connect a magnetic compass with the circuit

• Add more salt to the solution

• Replace the bulb with an LED

• All of the above

Rainwater is a better conductor of electricity when compared to distilled water.

Which of the following is correct justification for the given statement ?

• Absence of dissolved salts in rainwater

• Ionic dissociation takes place in rainwater

• Presence of oxygen in rainwater

• Flow of charges is inhibited in rainwater

Splitting of water molecule into Hydrogen and Oxygen takes place during electrolysis.

Watch the animation and choose the correct statement.

1. Hydrogen gets collected at the -ve electrode

2. Oxygen gets collected at the -ve electrode

3. Hydrogen gets collected at the +ve electrode

4. Oxygen gets collected at the +ve electrode

• 1 and 2

• 1 and 4

• 3 and 4

• 2 and 3

Shashank has to prepare for his test but unfortunately there's no electricity due to a power outage in the city. He grabs a potato, some connecting wires and a small bulb to build a mini torch.

1. What values has he displayed through his act?

2. What could be an alternative for potato in this experimental design?

3. Try to make a simple torch for yourself and embrace creativity 💡