Case Study Questions for Class 8 Science Chapter 14 Chemical Effects of Electric Current

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Here we are providing case study questions for CBSE Class 8 Science Chapter 14 Chemical Effects of Electric Current. We have covered case study questions for all the chapters of Class 8 Science.

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Case Study Questions for Class 8 Science Chapter 14 Chemical Effects of Electric Current

1 Case Studies · 4 Questions · With Answer & Explanation

Case Study: Electroplating and Its Applications

Read the passage carefully, then answer all four questions

Ch 14 · Chemical Effects of Electric Current

Sita and her mother reached a jewellery shop to purchase some ornaments. She liked a necklace very much, but her mother told her not to purchase it because it is not real gold. When she checked the information tag, it was written as 1gm gold. The necklace was quite big and heavy. She was surprised to see it and asked about it. The salesman explained that it is a gold-plated necklace.

Sita learned that the process of depositing a layer of any desired metal on another material by means of electricity is called electroplating. It is one of the most common applications of the chemical effects of electric current. Nowadays, people prefer to buy gold-plated jewellery; similarly, iron articles are often coated with zinc or chromium to protect them from rusting and corrosion.

In electroplating factories, the disposal of the used conducting solution is a major concern. It is a polluting waste and specific disposal guidelines should be followed to protect the environment.

Where and how the electroplating waste should be disposed of?

Answer

In an electroplating factory, the disposal of the used conducting solution is a major concern because it is a polluting waste, therefore it should be disposed of according to the disposal guidelines of the local authority.

What are the effects produced by the chemical reactions brought about by an electric current?

Answer

The passage of an electric current through a conducting solution causes chemical reactions. As a result, bubbles of a gas may be formed on the electrodes. Deposits of metal may be seen on electrodes. Changes in the colour of solutions may occur.

iii

Name the materials that can be used for electroplating.

Answer

Common metals used in the electroplating process include black and silver nickel, chromium, brass, cadmium, copper, gold, palladium, platinum, silver, tin and zinc.

What are the applications of electroplating?

Answer