JEE Advanced levelSingle correct optionDifficulty 3 of 3ev046
Which of the following pairings of a particulate with its class is correct?
AFine solid particles from crushing rock: mist
BLiquid sulphuric acid droplets: smoke
CBacteria in the air: non-viable particulate
DZinc oxide formed by condensation of zinc vapour: fumes
Answer: D
Fumes are solids formed by condensation of vapours, such as metal oxides. Bacteria are viable particulates, sulphuric acid droplets are a mist, and crushing rock produces dust, so the other pairs are wrong.