Multiple choice

Which of the following is not correct about air?

  1. Air is colourless.

  2. Air is odourless.

  3. Air is a mixture of six different gases.

  4. 99 % mass of the atmosphere is confined to the height of 32 km from the earth’s surface.

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

No, it is a mixture of nine different gases. Nitrogen, Oxygen, Argon, Carbon dioxide, Neon, Helium, Krypto, Xenon, and Hydrogen.

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