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

1.	Which of the following is (are) an endothermic process(es)? (i) Dilution of sulphuric acid (ii) Sublimation of dry ice (iii) Condensation of water vapours (iv) Evaporation of water (A) (i) and (iii) (B) (ii) only (C) (iii) only (D) (ii) and (iv)
Answer» The correct option is (D) (ii) and (iv) Explanation: Sublimation of dry ice and evaporation of water both are endothermic processes. These processes pull heat (energy) from their surroundings to change from one state to another. Hence both these processes produce cooling rather than heating. Dry ice absorbs heat from the environment to convert into gas. This feature makes it a good refrigerant. Processes of dilution of sulphuric acid and condensation of water vapours produce a large amount of heat. That is why these are exothermic processes.

Which of the following is (are) an endothermic process(es)? (i) Dilution of sulphuric acid (ii) Sublimation of dry ice (iii) Condensation of water vapours (iv) Evaporation of water (A) (i) and (iii) (B) (ii) only (C) (iii) only (D) (ii) and (iv)

Answer»

The correct option is (D) (ii) and (iv)

Explanation:

Sublimation of dry ice and evaporation of water both are endothermic processes. These processes pull heat (energy) from their surroundings to change from one state to another. Hence both these processes produce cooling rather than heating. Dry ice absorbs heat from the environment to convert into gas. This feature makes it a good refrigerant. Processes of dilution of sulphuric acid and condensation of water vapours produce a large amount of heat. That is why these are exothermic processes.

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