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Which of the following is/are in random motion?

Which of the following is/are in random motion?

i. Pollen grains in water
ii. The molecules of hydrogen gas
ii. Fine chalk particles floating in air

A.

i and ii only

B.

i and iii only

C.

ii and iii only

D.

i, ii and iii

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Correct answer is D

No explanation has been provided for this answer.

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