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

Endothermic vs Exothermic Reaction-01.jpg

Here,

  • Endo means in and thermic means heat . So, in these reactions heat is absorbed.
  • Exo means out and thermic means heat . So, in these reactions, heat is evolved

 

Here,

  • Dilution of sulphuric acid generates heat, so it is an exo thermic process
  • Sublimation of dry ice needs heat, so it is an endo thermic process
  • Condensation of water vapours generates heat, so it is an exo thermic process
  • Evaporation of water needs heat, so it is an endo thermic process

 

So, the correct answer is (d) -  (ii) and (iv)

  1. Class 10
  2. Chapter 1 Class 10 - Chemical Reactions and Equations (Term 1)

About the Author

CA Maninder Singh's photo - Founder at Teachoo
CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo