Give an example of a chemical reaction for each of the following situations:
Give an example of a chemical reaction for each of the following situations:
(a) A change in colour is observed.
(b) A gas is evolved.
(c) Sound is produced.
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(a) Reaction between copper sulphate solution and iron metal.
(b) Reaction between baking soda and vinegar (carbon dioxide is evolved).
(c) Burning of crackers.
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