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Sulfur dioxide:

a. creates a reddish-brown haze in the sky
b. is a secondary air pollutant
c. has an irritating odor and is colorless
d. is relatively harmless to the environment

1 Answer

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it is a toxic gas with a pungent, irritating smell and is colourless.

so, option c) is correct

hope it helped
User Piotr Perak
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