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Question

What visible change is observed in limewater (colourless) when CO2 gas is passed through it?

A
The solution turns blue
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B
The solution turns green
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C
The solution turns milky
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D
No colour change
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Solution

The correct option is C The solution turns milky
  • Limewater is the common name for calcium hydroxide. When CO2 gas is passed through it, calcium carbonate is formed.
  • Calcium carbonate is white in colour and insoluble in water. Hence, the solution turns milky. The reaction is:
Ca(OH)2(aq)+CO2(g)CaCO3(s)+H2O(l)

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