What is the colour of the precipitate obtained by passing CO₂ gas through lime water ?
- A.Green
- B.Blue
- C.White
- D.Brown
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Lime water is a clear solution of calcium hydroxide, Ca(OH)₂. When carbon dioxide is passed through it, insoluble calcium carbonate, CaCO₃, forms as a fine white precipitate, which makes the lime water turn milky.
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