Q. 245.0( 2 Votes )

The following experimental set-ups were kept in the laboratory to show that ‘CO2 is given out during respiration’.

After 2 hours, in which the delivery tube does the water rise?

Answer :

In set up A, the water rise as the rubber cork perfectly seals the conical flask hence creating the vacuum but in set up B due to cotton plug as cotton cannot perfectly seal the flask, and air can pass through as a result water does not rise up as water needs perfect vacuum to rise up.

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