Question

Which of the following is (are) an endothermic process(es)?

• A. Dilution of sulphuric acid
• B. Sublimation of dry ice
• C. Condensation of water vapors
• D. Evaporation of water

Answer 1

Answer: (B), (D)

Evaporation of water

Explanation for correct options:

B. Sublimation of dry ice

D. Evaporation of water

Exothermic reactions:

• The chemical reaction in which the heat is released is known as an Exothermic reaction.
• Examples are the burning of a candle and the reaction of a strong acid with water.

Endothermic reactions:

• The chemical reaction in which the heat is absorbed is known as an Endothermic reaction.
• Examples are melting ice cubes and melting solid salts.

In processes such as sublimation of dry ice and evaporation of water the heat is being absorbed. Thus, these processes are endothermic processes.

Explanation for incorrect options:

A. In the dilution of sulphuric acid, the heat is released thus it is an exothermic process.

C. Condensation of water vapors is an exothermic process.

Hence, the correct options are B and D.