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Chapter 14 Chemical Effects of Electric Current Solutions

Question - 11 : -
Prepare a list of objects around you that are electroplated.

Answer - 11 : -

Examples of electroplated objects are as follows:

(i) Chromium plating is done on different parts of cars, buses and motor cycles to give them shiny appearance.

  1. A fine layer of gold is deposited on the silver ornaments and they are called gold-plated ornaments.
  2. Iron used in constructing a building is coated with a layer of zinc. This protects iron from corrosion and rusting.

Question - 12 : -
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 the battery and why?

Answer - 12 : -

Copper ion is positively charged. It is attracted towards the plate which is connected to the negative terminal of the battery. As copper ions are transferred to the thin copper plate, this thin pure copper plate must be connected to the negative terminal of the battery. Consequently, impure copper rod is connected to the positive terminal of the battery.

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