Two students were asked to arrange the experimental set X and Y separately to show that a gas is evolved during respiration .In set up X the student used a foam plug to hold the bent test tube in mouth of flask and in setup Y the student used a rubber cork to hold the bend tube what is observation after 4 hours?
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In X's setup no change will be observed as foam has minute spaces which will allow the the evolved CO2 to get mixed with atmospheric CO2.
In Y's setup if you take a burning match stick nearer it will blow off which indicated the presence of CO2. Since rubber cork does not allow the evolved gas to go out better changes could be observed.
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dishankpatel16082003:
Thanks recommending my answer
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