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Which of the following gas is not colorless?

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Which of the following gas is not colorless?

(a) NO

(b) O3

(c) Pb

(d) SO3

I got this question in homework.

This interesting question is from Effects of Air Pollution, Design of Stack Height in section Air Pollution of Environmental Engineering

1 Answer

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Right answer is (a) NO

For explanation: NO is a highly reactive gas which is reddish brown in color, whereas  O3, Pb and SO3 are colorless gas.

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