(a) What is meant by a chemical reaction Explain with the help of an example (b) Give one example each of a chemical reaction characterised by The evolution of a gas change in colour formation of a precipitate change in temperature change in state

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(a) What is meant by a chemical reaction ? Explain with the help of an example. (b) Give one example each of a chemical reaction

(a) What is meant by a chemical reaction ? Explain with the help of an example.
(b) Give one example each of a chemical reaction characterised by :

The evolution of a gas
change in colour
formation of a precipitate
change in temperature
change in state.

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