NCERT Solutions for Chapter: Chemical Effects of Electric Current, Exercise 3: SHORT ANSWER QUESTIONS

Boojho made the circuit given in figure and observed that the bulb did not glow. On Paheli's suggestion he added one more cell in the circuit. The bulb now glows. Explain.

Paheli set up an experiment using liquid $\mathrm{A}$ in the beaker as shown in figure. She observed that the bulb glows. Then she replaced the liquid $\mathrm{A}$ by another liquid $\mathrm{B}$. This time the bulb did not glow. Boojho suggested replacing the bulb by an LED. They observed that the LED glows. Explain.

Paheli wants to deposit silver on an iron spoon. She took silver nitrate $\left({\mathrm{AgNO}}_3\right)$ solution in a beaker and setup a simple circuit for electroplating. Which terminal of the battery should the spoon be connected to? What material should the other electrode be made of?
 

Why is tin electroplated on iron to make cans used for storing food?
 

Observe the given figure.

Which of these two circuits $\mathrm{A} \mathrm{or} \mathrm{B}$ shows the correct observation?

Observe the following circuits carefully. In which circuit will the bulb glow. Write “Yes' or "No' about each of the circuit given in figures.