The correct answer among the choices given is option B. The purpose of an expectorant is to liquefy mucous. An expectorant is a drug that aids in the clearance of mucus in the respiratory system. It thins out mucus so it can be expelled from the body easier.
<span>No2 would be the free radical as it has an unpaired electron in it's grouping. Since free radicals are defined by the attribute of having an unpaired electron in their make-up, no2 fits this definition.</span>
Explanation:
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