Question

The following reaction is used for the preparation of oxygen gas in the laboratory.
$2KCl{O}_3\left(s\right)\underset{Catalyst}{\overset{Heat}{\to }}2KCl\left(s\right)+3O_2\left(g\right)$
Which of the following statement is 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 1

The correct option is A It is a decomposition reaction and endothermic in nature

$2KCl{O}_3\left(s\right)\underset{catalyst}{\overset{heat}{\to }}2KCl\left(s\right)+3O_2\left(g\right)$
In the above reaction, potassium chlorate($KCl{O}_3$) decomposes to form potassium chloride(KCl) and oxygen($O_2$). Also as shown in the equation, heat is supplied for the reaction to take place. Therefore, it is a decomposition reaction which is also endothermic in nature.