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Question
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.
(a) A change in colour is observed.
(b) A gas is evolved.
(c) Sound is produced.
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Solution
(a) When Iron nails are put into Copper sulphate solution, Iron sulphate and Copper are formed and colour of solution changes from blue to green.
Iron (Fe) + CuSO4(blue)→FeSO4(greenish + Copper (Cu))
(b) When acetic acid is added to a solution of sodium hydrogen carbonate gas is evolved in the form of bubbles due to the formation of carbon dioxide.
Vinegar (Acetic acid) + Baking soda (Sodium hydrogencarbonate )\rightarrow CO2 (gas) + other substances
(c) Burning of crackers- It is a chemical reaction in which due to the burning of crackers there is production of light, sound and heat.
Iron (Fe) + CuSO4(blue)→FeSO4(greenish + Copper (Cu))
(b) When acetic acid is added to a solution of sodium hydrogen carbonate gas is evolved in the form of bubbles due to the formation of carbon dioxide.
Vinegar (Acetic acid) + Baking soda (Sodium hydrogencarbonate )\rightarrow CO2 (gas) + other substances
(c) Burning of crackers- It is a chemical reaction in which due to the burning of crackers there is production of light, sound and heat.
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