Question

A scrubber in the exhaust of a chemical industrial plant removes

(a) Gases like sulphur dioxide

(b) Particulate matter of the size 5 micrometer or above

(c) Gases like ozone and methane

(d) Particulate matter of the size 2.5 micrometer or less

Answer 1

Correct option (a) Gases like sulphur dioxide

Explanation

Scrubber is an electrostatic precipitator in which the dirty air Is cleaned by capturing the gas like SO₂ and other oxides in water/lime spray (CaCO₃). The calcium in limestone combines chemically with the sulphur to produce calcium sulphate (CaSO₄), which is separately collected. The detailed mechanism is shown in the figure below :