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The answer is Carbon Dioxide (CO2).

I assume this is what you mean - Carbon Dioxide is the waste product of respiration that can suffocate some animals, including humans. It is used by plants in photosynthesis, and these plants produce Oxygen (O2). It reacts with lime water and turns it a sort of milky colour.

The equation for this reaction is

Carbon Dioxide (CO2) + Calcium Hydroxide (Ca(OH)2) ---> Calcium Carbonate (CaCO3) + Water (H2O)

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Wiki User

15y ago
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6mo ago

The colorless gas with a suffocating smell that dissolves in lime water is sulfur dioxide (SO2). When sulfur dioxide is dissolved in lime water, it forms sulfurous acid, which causes the solution to turn cloudy due to the formation of calcium sulfite.

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Q: What is the colourless gas having suffocating smell dissolves in lime water?
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