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Question

The following reaction is used for the preparation of oxygen gas in the laboratory 2KClO3(s)Heat2KCl(s)+3O2(g). Which of the following statement(s) is(are) correct about the reaction?


A

It is a decomposition reaction and endothermic in nature.

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B

It is a combination reaction.

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C

It is a decomposition reaction and accompanied by the release of heat.

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D

It is a photochemical decomposition reaction and exothermic in nature.

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Solution

The correct option is A

It is a decomposition reaction and endothermic in nature.


Explanation for correct option:

A. It is a decomposition reaction and endothermic in nature.

Reaction for the preparation of oxygen gas:

  • When Potassium chlorateKClO3 is heated, it yields Potassium chlorideKCl and oxygenO2.
  • The chemical reaction can be depicted as:

2KClO3(s)Heat2KCl(s)+3O2(g)

  • It is endothermic in nature.
  • This reaction is a decomposition reaction, i.e. A decomposition reaction can be defined as a chemical reaction in which one reactant breaks down into two or more products.

Explanation for incorrect options:

B. It is a combination reaction.

  • The reaction for the formation of oxygen is a decomposition reaction.

C. It is a decomposition reaction accompanied by the release of heat.

  • It is an endothermic reaction.

D. It is a photochemical decomposition reaction and exothermic in nature.

  • This reaction does not involve sunlight and it is not exothermic in nature.

Hence, the correct option is A i.e. It is a decomposition reaction and endothermic in nature.


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