Concise chemistry of class 9th chapter 2 chemical changes and reactions
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(a) A chemical reaction is the process of breaking the chemical bonds of the reacting substances (reactants) and making new bonds to form new substances (products).
(b) Conditions necessary for a chemical change or reaction are
(i) Evolution of gas
(ii) Change of colour
(iii) Formation of precipitate
(iv) Change of state
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