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Study the following information given and answer the questions that follow. Ethanol is a renewable biofuel because it is made from biomass. Ethanol is a clear, colourless alcohol made from a variety of biomass materials. Ethanol producers mostly use food grains and crops with high starch and sugar content such as corn, sorghum, barley, sugar cane, and sugar beets. The most common ethanol production processes today use yeast to ferment the starch and sugars in corn, sugar cane, and sugar beets. (a) What is the chemical formula for ethanol? (b) What other compound is obtained as a by-product when ethanol is obtained from a sugar? (c) What would be the products formed when ethanol undergoes complete combustion? Support your answer with a balanced chemical equation.
Which row in the table below shows the correct products of anaerobic respiration in humans and in yeast?
Write the chemical equation for the process of fermentation in yeast. Under what conditions does fermentation occur and what are its products?
Assertion (A): Dough rises when yeast is mixed into it and kept in a warm place. Reason (R): Yeast releases oxygen gas while breaking down sugar.
Rohan sets up two flasks as shown, each with a balloon over its mouth, and keeps them in a warm place for 3–4 hours. (a) In which flask will the balloon inflate? Why? (b) How can he test the gas collected? (c) Why must the flasks be kept warm?
Meena's mother soaks rice and urad dal, grinds them into a batter and leaves it in a covered vessel overnight. By morning the batter has risen, looks spongy and smells slightly sour. In winter, she keeps the vessel near the warm kitchen stove because otherwise the batter does not rise well. She then steams the batter to make soft idlis.
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