Question

Match the following:
$$\begin{array}{cccc}& \text{Column 1}& & \text{Column 2}\\ \text{(p)}& \text{Scrubber}& \text{(i)}& \text{1000 volts electrodes}\\ \text{(q)}& \text{Catalytic converter}& \text{(ii)}& \text{flue gas column}\\ \text{(r)}& \text{Electrostatic precipitator}& \text{(iii)}& \text{redox reactions}\end{array}$$

• A. p - (iii), q - (ii), r - (i)
• B. p - (ii), q - (iii), r - (i)
• C. p - (i), q - (ii), r - (iii)
• D. p - (ii), q - (i), r - (iii)

Answer 1

The correct option is B p - (ii), q - (iii), r - (i)

A catalytic converter is an emission control device that converts toxic gases and pollutants in exhaust gas to less toxic pollutants by catalysing a redox reaction. They have metals like platinum, palladium and rhodium as catalysts and are fitted into automobiles to reduce emission of poisonous gases.
An electrostatic precipitator can remove close to $99\%$ of particulate matter. It has electrodes that are maintained at several thousand volts, which produce a corona that releases electrons. These electrons attach to dust particles from the exhaust, giving them a net negative charge. The charged dust particles settle down as they are attracted to the collecting plates.
Scrubbers work on a single target pollutant and have water or designed adsorbent fluids, which are sprayed down through a rising column of flue gas. This motion of particles facilitates reactions and the pollutant gas dissolves in the wash, which is then purified or discarded.