Question

Before the invention of CFCs, which of the compounds was used extensively as a refrigerant?

(a) Ammonia

(b) Diethyl ether

(c) Sulfur dioxide

(d) Ice

The question was asked in an online quiz.

This key question is from P-Block Elements topic in section P-Block Elements of Chemistry – Class 12

Answer 1

The correct choice is (c) Sulfur dioxide

To elaborate: Sulfur dioxide was used as a refrigerant before CFCs. This is due to its characteristic features bearing high heat of evaporation and ability to be easily condensed.