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Question

Assertion: CO2 diffuses only from tissue to alveoli and not in the reverse direction.
Reason: CO2 is 10 times more soluble than O2.

A
Both A and R are true and R is the correct explanation of A.
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B
Both A and R are true but R is not a correct explanation of A
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C
A is true but R is false
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D
A and R are false
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Solution

The correct option is C A is true but R is false
Concentration of CO2 is more in the tissues than in the alveoli, thereby diffusion of CO2 takes place from tissue to blood and from blood to alveoli and not in the reverse direction. The solubility of CO2 is 20 times more than that of O2 but the reason for the diffusion of CO2 from tissue to alveoli is concentration gradient not the solubility of the gases.

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