A test tube containing molasses solution and yeast is kept in a warm place overnight. The gas collected from this mixture

Extinguishes the flame

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Bursts into flame when ignited

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Turns lime water milky

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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 $C O_{2}$ . As Molasses mainly contain sugar, yeast will do anaerobic fermentation of the molasses and forms $C O_{2}$ gas as a by-product.
This $C O_{2}$ gas can (i) extinguishes the flame, and (ii) Turns lime water milky.
So, the correct answer is (D).

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