Question

Match the items of Column I and Column II and select the correct combinations.

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

• A. a-q, b-r, c-p
• B. a-r, b-q, c-p
• C. a-r, b-q, c-r
• D. a-r, b-p, c-q
• E. a-p, b-r, c-q

Answer 1

The correct option is D a-r, b-p, c-q

• Electrostatic precipitator is used to remove particulate matter present in the air. The particulate matter are charged and passed through a chamber where they the particles lose their charge and settle down.
• Scrubbers are used to remove gases like sulphur dioxide (SO₂). The exhaust is passed though a spray of lime or water.
• Catalytic convertors consist of expensive metals like platinum- palladium and rhodium as catalysts which are fitted in the automobiles to reduce the emission of poisonous gases. When the exhaust passes through catalytic convertor, unburnt hydrocarbons get converted into carbon dioxide and water, carbon monoxide is converted to carbon dioxide and nitric oxide is converted to nitrogen gas.

So, the correct answer is 'a-r, b-p, c-q'.