17. What is corrosion? State the conditions necessary for rusting of iron. How rusting is harmful?
18.What is a Redox reaction? Give an example,
19. Blue crystals of copper sulphate on heating in a dry test tube become colourless. Give
reasons
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Explanation:
The slow eating up of metals layer by layer due to the reaction with moisture present in air is known as corrosion. The condition required for rusting of iron is presence of moisture & iron should be coating free. Rusting is harmful because it destroy the quality of metal and also reduce its strength.
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