Scrubber technology used in automobile to remove mainly which harmful…

The correct answer is Option (1) → Sulphur dioxide

Option (1) Sulphur dioxide — Correct. A scrubber cleans exhaust by passing the gas through a spray of water or lime. It removes gases like sulphur dioxide.

Note 1: NCERT describes the scrubber for the exhaust of thermal power plants and industries; the exhaust of automobiles is cleaned by catalytic converters.

Note 2: This question is from Chapter 16, Environmental Issues, of the pre-rationalised NCERT book. This chapter is not in the present NCERT book (2026-27). The extract below is from the pre-rationalised edition.

NCERT Extract (Pre-rationalised edition, Chapter 16, Environmental Issues):
Air Pollution and Its Control – “… There are several ways of removing particulate matter; the most widely used of which is the electrostatic precipitator (Figure 16.1), which can remove over 99 per cent particulate matter present in the exhaust from a thermal power plant. It has electrode wires that are maintained at several thousand volts, which produce a corona that releases electrons. These electrons attach to dust particles giving them a net negative charge. The collecting plates are grounded and attract the charged dust particles. The velocity of air between the plates must be low enough to allow the dust to fall. A scrubber (Figure 16.1) can remove gases like sulphur dioxide. In a scrubber, the exhaust is passed through a spray of water or lime.”