.(A).What does you mean by exothermic and endothermic reactions ? Give example also. 21.(B).A solution of a substance x is used for whitewashing ,name the substance x and write their chemical formula. 21.(C).Plaster of Paris store in a moisture proof container why. 21.(D).What are amphoteric oxides .give two examples. 21.(E).Why sodium kept immersed in kerosene oil.
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(A) Exothermic reactions : Reactions in which heat is given out along with the products are called exothermic reactions.
•The rusting of steel is an example of an exothermic chemical reaction....
Endothermic reactions:Reactions in which energy is absorbed are known as endothermic reactions.
•melting ice cubes example...
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