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ICSE Class 9 Chemistry Question 24 of 55

ICSE Questions Set in Previous Years — Question 24

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Question

Question 24

Explain the following :

A white crust forms on the surface of lime water that has been exposed to the atmosphere.

Answer

Carbon dioxide present in the atmosphere turns lime water milky due to the formation of white ppt. of calcium carbonate.

CO2 + Ca(OH)2 ⟶ CaCO3↓ + H2O

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