The following reaction is used for the preparation of oxygen gas in the laboratory

Reaction of  KClO3 in the presence of heat - Teachoo.jpg

Which of the following statement(s) is(are) correct about the


(A) It is a decomposition reaction and endothermic in nature

(B) It is a combination reaction

(C) It is a decomposition reaction and accompanied by release of heat

(D) It is a photochemical decomposition reaction and exothermic in nature



In the reaction, 

  • KClO 3 is decomposing to KCl and O 2  
  • and heat is being supplied in order to carry out the reaction, this is an endothermic reaction .



  • Photochemical decomposition is the one which is carried out in the presence of light. Since light is not given in the reaction.. It is not Photochemical decomposition


So, the correct option is (a) It is a decomposition reaction and endothermic in nature

  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