a chemical reaction is often accompanied by external indication for characterstics give two examples for a chemical reaction is accompanied by a change in colour of reactants and products on completion of the reaction
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zn+so4= zn so4 is change the color after reaction
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when red lead in the presence of heat it decomposes into yellow colour lead oxide and oxygen
2Pb3O4 - 6PbO + O2
( red lead)
2Pb3O4 - 6PbO + O2
( red lead)
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