Question 15 - MCQs from NCERT Exemplar - Chapter 1 Class 10 - Chemical Reactions and Equations

Last updated at August 14, 2026 by

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

reaction?

(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

 

Answer

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 .

 

Also,

  • 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

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