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Carbon dioxide (CO2) is a slightly toxic, odorless, colorless gas with a slightly pungent, acid taste. However it is not odorless. It has a strong odor when it is concentrated. If it were odorless, it cold not be smelled, but it can. In fact you can say it smells like a carbonated beverage.
Carbon dioxide which we breath out is colorless, odorless and tasteless. Plants use it for photosynthesis.

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10y ago
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14y ago

odorless...

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Q: What odor does carbon dioxide have?
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