Chemical Effects of Electric Current – 4

The bulb does not glow in the setup shown in Figure. List the possible reasons. Explain your answer. What is the first reason you heard in this audio clip?

• 
• The bulb may be fused.

• The battery may be used up.

• The conductivity of liquid may be very low.

• The connections of wires in the circuit may be loose.

The bulb does not glow in the setup shown in Figure. List the possible reasons. Explain your answer. What is the second reason you heard in this audio clip?

• 
• The bulb may be fused.

• The battery may be used up.

• The conductivity of liquid may be very low.

The bulb does not glow in the setup shown in Figure. List the possible reasons. Explain your answer. What is the third reason you heard in this audio clip?

• 
• The bulb may be fused.

• The battery may be used up.

• The conductivity of liquid may be very low.

The bulb does not glow in the setup shown in Figure. List the possible reasons. Explain your answer. What is the third reason you heard in this audio clip?

• 
• The bulb may be fused.

• The battery may be used up.

• The conductivity of liquid may be very low.

The bulb does not glow in the setup shown in Figure. List the possible reasons. Explain your answer. What is the fourth reason you heard in this audio clip?

• 
• The bulb may be fused.

• The battery may be used up.

• The conductivity of liquid may be very low.

The bulb does not glow in the setup shown in Figure. List the possible reasons. Explain your answer. What is the fifth reason you heard in this audio clip?

• 
• The bulb may be fused.

• The battery may be used up.

• The conductivity of liquid may be very low.

• The liquid may be non-conductor of electricity.

The process that you saw in Activity 14.7 is used for purification of copper. A thin plate of pure copper and a thick rod of impure copper are used as electrodes. Copper from impure rod is sought to be transferred to the thin copper plate. Which electrode should be attached to the positive terminal of battery and why? What is the first statement of this audio clip?

• A thick rod of impure copper should be connected to the positive terminal of the battery.

• A thin plate of pure copper should be connected to the negative terminal of the battery.

• On passing electric current, the metal dissolves from the impure anode and goes into the electrolyte solution.

• The positively charged ions of metals present in their molten compounds are attracted by the negatively charged electrode.

The process that you saw in Activity 14.7 is used for purification of copper. A thin plate of pure copper and a thick rod of impure copper are used as electrodes. Copper from impure rod is sought to be transferred to the thin copper plate. Which electrode should be attached to the positive terminal of battery and why? What is the second statement of this audio clip?

• A thick rod of impure copper should be connected to the positive terminal of the battery.

• A thin plate of pure copper should be connected to the negative terminal of the battery.

• On passing electric current, the metal dissolves from the impure anode and goes into the electrolyte solution.

• The positively charged ions of metals present in their molten compounds are attracted by the negatively charged electrode.

The process that you saw in Activity 14.7 is used for purification of copper. A thin plate of pure copper and a thick rod of impure copper are used as electrodes. Copper from impure rod is sought to be transferred to the thin copper plate. Which electrode should be attached to the positive terminal of battery and why? What is the third statement of this audio clip?

• A thick rod of impure copper should be connected to the positive terminal of the battery.

• A thin plate of pure copper should be connected to the negative terminal of the battery.

• On passing electric current, the metal dissolves from the impure anode and goes into the electrolyte solution.

• The positively charged ions of metals present in their molten compounds are attracted by the negatively charged electrode.

The process that you saw in Activity 14.7 is used for purification of copper. A thin plate of pure copper and a thick rod of impure copper are used as electrodes. Copper from impure rod is sought to be transferred to the thin copper plate. Which electrode should be attached to the positive terminal of battery and why? What is the fourth statement of this audio clip?

• A thick rod of impure copper should be connected to the positive terminal of the battery.

• A thin plate of pure copper should be connected to the negative terminal of the battery.

• On passing electric current, the metal dissolves from the impure anode and goes into the electrolyte solution.

• The positively charged ions of metals present in their molten compounds are attracted by the negatively charged electrode.