Question

Observe the given apparatus carefully showing an activity performed to compare the carbon dioxide content of inhaled and exhaled air.What would be the observation for T1 and T2 test tubes and itscorrect explanation? [(+) indicates milky colouration in limewater]
$T_1$ $T_2$ Explanation

• A. +++ ++ $C{O}_2$ content is little higher in inhaled air
• B. ++++ + $C{O}_2$ content is considerably higher in inhaled air
• C. + ++++ $C{O}_2$ content is considerably higher in exhaled air
• D. ++ ++ $C{O}_2$ content is same in both inhaled and exhaled air

Answer 1

The correct option is C + ++++ $C{O}_2$ content is considerably higher in exhaled air

The air we breathe in contains about $0.04\%$ of carbon dioxide.
The air we breathe out contains about $4\%$ of carbon dioxide.
In other words, exhaled air contains 100 times the concentration of carbon dioxide than inhaled air.
Hence the correct option is {c}