Observe the set-up given in Fig. 2.15 and answer the following questions. What happens to the sugar solution Class 8
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Observe the set-up given in Fig. 2.15 and answer the following questions. What happens to the sugar solution Class 8
Observe the set-up given in Fig. 2.15 and answer the following questions. Class 8
(i) What happens to the sugar solution in flask A?
(ii) What do you observe in test tube B after four hours? Why do you think this happened?
(iii) What would happen if yeast were not added to flask A?
Answer:
(i) The yeast ferments the sugar in the warm solution, producing carbon dioxide gas and a small amount of alcohol.
(ii) Lime water in test tube B turns milky. This happens because CO2 produced in flask A travels through the delivery tube into flask B and reacts with lime water, confirming the presence of carbon dioxide.
(iii) Fermentation would not occur, so no carbon dioxide would be produced. As a result, lime water would remain clear in test tube B.