Question

In an experiment to check the amount of carbon dioxide, atmospheric air and exhaled air is passed through lime water. Which of the following is the best procedure to collect atmospheric air for analysis?

• A. Collect air from higher altitudes let air enter the tube using a motor
• B. Suck the air inside the tube on one side, atmospheric air enters from another end
• C. Blow the air from the mouth
• D. Any of the above

Answer 1

The correct option is B Suck the air inside the tube on one side, atmospheric air enters from another end

If we suck the air from one end of the tube it will create a vacuum to the other side which decreases the pressure and atmospheric air is filled inside the other end.

So the correct option is 'Suck the air inside the tube on one side, atmospheric air enters from another end'.