Question

Match column I with column II, and choose the correct combination from the options given below.

	Column-I		Column-II
a.	Electrostatic precipitator	p.	Removes gases like $S{O}_2$
b.	Scrubber	q.	Reduce automobile emission
c.	Catalytic converter	r.	Removes particulate matter

• A. $a$ $b$ $c$
  $r$ $p$ $q$
• B. $a$ $b$ $c$
  $p$ $q$ $r$
• C. $a$ $b$ $c$
  $q$ $r$ $p$
  
• D. $a$ $b$ $c$
  $r$ $q$ $p$

Answer 1

The correct option is A $a$ $b$ $c$

$r$ $p$ $q$
Electrostatic precipitator - Removes particulate matter
Electrostatic precipitator is a device used to remove the particulate matter released from the thermal power plant in which the electrical wires create a corona of electrons giving the particles the negative charge. These negatively charged particles are then attracted to the collecting plate grounded in the earth.

Scrubber - Removes gases like $S{O}_2$
Scrubber is a device which is used to remove harmful gases from the industrial exhausts.
The gases like sulphur dioxide are released from the industries which are removed from the exhaust by passing the air through the spray of water or lime. Scrubber is used to remove sulphur dioxide gas from the industrial exhaust.

Catalytic converter - Reduce automobile emissions
Catalytic converters are devices made of expensive metals, such as platinum-palladium and rhodium which work as catalysts.
They are fitted into automobiles for reducing the emission of poisonous gases.
Catalytic converters convert the harmful gases such as carbon monoxide, nitrogen dioxide present in the vehicular exhaust into less harmful gases such as carbon dioxide and water vapour, before they are discharged into the environment.