What is the proper technique to test the odour of a vapour in a test tube?

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Hold the test tube near the nose and sniff.

Use a micropipet to capture some of the gas and sniff that.

Hold the teat tube above the nose and pour the gas toward it,

Hold the test tube near the nose and waft the gas toward it with a hand.

answer is D.

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Detailed Solution

Hold the test tube close to the nose and left the gas towards it with a hand the correct way to test the smell of vapour in a test tube is to

You run the danger of harming your mucous membranes or your lungs when you directly inhale the chemicals you are employing in the lab. When it's important to smell chemicals in a lab, the right way to do it is to cup your palm over the container and blow air in your face.

Hence the correct option is D

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