What visible change is observed when CO2 is passed through lime water and that change is due to the formation of which compound?
A
Blue color, CuSO4
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B
Green color, CuCO3
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C
Milkiness, CaCO3
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D
Milkiness, Ca(HCO3)2
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Solution
The correct option is C Milkiness, CaCO3 The reaction is:
Ca(OH)2+CO2→CaCO3+H2O
Lime water is calcium hydroxide. Calcium carbonate is formed when CO2 is passed through it. Calcium carbonate is white in colour and insoluble in water, hence the milkiness.