To solve this problem, we need to analyze the given statements:$\newline \bullet$Statement I: In a scrubber, the exhaust from the thermal plant is passed through electric wires to charge the dust particles.$\newline$ - A scrubber is a device used to remove pollutants from industrial exhaust streams.$\newline$ - It typically uses liquid to wash unwanted pollutants from a gas stream.$\newline$ - Charging dust particles with electric wires is a function of an electrostatic precipitator, not a scrubber.$\newline$ - Therefore, Statement I is incorrect.$\newline \bullet$Statement II: Particulate matter (PM 2.5) cannot be removed by a scrubber but can be removed by an electrostatic precipitator.$\newline$ - PM 2.5 refers to particulate matter with a diameter of 2.5 micrometers or smaller.$\newline$ - Scrubbers are generally less effective at removing very fine particles like PM 2.5.$\newline$ - Electrostatic precipitators are effective at removing fine particles, including PM 2.5, by using electrical charges.$\newline$ - Therefore, Statement II is correct.$\newline$Based on the analysis, the correct option is:$\newline$Option 4: Statement I is incorrect but Statement II is correct.