In the experimental set-up to show that ‘‘the germinating seeds give out carbon dioxide’’, answer the following questions :(i) Why do we keep the conical flask airtight?(ii) Name the substance kept in the small test tube inside the conical flask. Write its role.(iii) Why does water rise in the delivery tube?

(i) We keep the conical flask airtight to prevent the escape of carbon dioxide produced by germinating seeds. If the carbon dioxide escapes out, there will be no rise in the water level in the glass tube.

(ii) Potassium hydroxide (KOH) is the substance kept in the small test tube inside the conical flask because it is a strong base and absorbs the carbon dioxide liberating in the reaction forming the potassium carbonate K2CO3.

(iii) The water level rise in the delivery tube due to the formation of a vacuum in the flask. Water moves from high pressure to low pressure.

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Updated on: 16-Jan-2023

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