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It is necessary so that to know about the same reaction again a lot of work don't have to be done
it is same as the supreme court being the book of record
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(a) The various ways in which a chemical equation can be made more informative are : (i) By indicating the physical states of the reactants and products. Example: Gaseous state is indicated by the symbol (g). (ii) By indicating the heat changes taking place in the reaction.
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