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Question

If we blow into a glass of lime water, what is the change in color we can expect?


  1. A white liquid turns colorless

  2. There is no change of color to be expected

  3. A white liquid turns pink

  4. A colorless liquid turns milky white


Solution

The correct option is D

A colorless liquid turns milky white


Lime water is a diluted solution of calcium hydroxide. Pure lime water is clear and colourless. When one blows into a glass of lime water, the carbon dioxide present in our breath reacts with calcium hydroxide and forms calcium carbonate. This end product i.e., calcium carbonate is insoluble in water which gives a milky appearance to the solution.

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