Question

Abhisrija arranged two setups P and Q as shown below.

Both experiments are carried out at 25°C. 

(a) Name the current carriers in setup P and Q. 

(b) What is the effect of an increase in temperature on the conductivity of NaCl solution and Cu wire? 

(c) What happens to the chemical composition of NaCl and Cu wire when current is passed through both setups for a prolonged period of time?

Answer 1

(a) The current carriers in setup P are free mobile electrons. 

The current carriers in setup Q are ions present in the solution.

(b) In NaCl solution conductivity rises with a rise in temperature. 

In Cu wire, the conductivity reduces with a rise in temperature.

(c) When current is passed through the setup Q for prolonged time, the chemical composition changes due to electrochemical reactions.

When current is passed through setup P for prolonged time, the chemical composition remains the same.