A test tube containing molasses solution and yeast is kept in a warm place overnight. The gas collected from this mixture
A
Extinguishes the flame
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B
Bursts into flame when ignited
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C
Turns lime water milky
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D
Both (a) and (c)
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Solution
The correct option is D Both (a) and (c)
Yeast do anaerobic fermentation by consuming sugar and forming ethanol and CO2. As Molasses mainly contain sugar, yeast will do anaerobic fermentation of the molasses and forms CO2 gas as a by-product.
This CO2 gas can (i) extinguishes the flame, and (ii) Turns lime water milky.