Q15 of 24 Page 79

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

Food cannot be stored in iron cans without any coating because iron is more prone to corrosion due to environment and hence food stored in iron cans will become non-consumable. Therefore, tin is used as a coating over iron as it prevents iron from rusting and also gives a shiny appearance to the can.



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13

Paheli set up an experiment using liquid A in the beaker as shown in Fig. 14.4. She observed that the bulb glows. Then she replaced the liquid A by another liquid B. This time the bulb did not glow. Boojho suggested replacing the bulb by an LED. They observed that the LED glows. Explain.


 14

Paheli wants to deposit silver on an iron spoon. She took silver nitrate (AgNO3) 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?

 16

Observe Fig. 14.5.


Which of these two circuits A or B shows the correct observation?


 17

Observe the following circuits carefully. In which circuit will the bulb glow. Write ‘Yes’ or ‘No’ in the blank space provided along each of the circuit given in Fig. 14.6.