Q3 of 152 Page 45

Why does the colour of copper sulphate solution change when an iron nail is kept immersed in it ?

Colour of Copper Sulphate Solution changes due to displacement reaction taking place between iron and copper which forms iron suplhate when iron nail is kept immersed in it.

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1 What type of reaction is represented by the digestion of food in our body? 2 Name the various types of chemical reactions. 4 Write the balanced chemical equation for the following reaction :

Zinc + Silver nitrate Zinc nitrate + Silver

 5 Which term is used to indicate the development of unpleasant smell and taste in fat and oil containing foods due to aerial oxidation (when they are kept exposed for a considerable time)?