24. Select the right answers: NCERT- Exemplar questions - III

Exercise condition:

5 m.

Choose the best answer:

1. The following reaction \(2KClO_3\) → \(2KCl\) + \(3O_2\) is used for the preparation of oxygen gas in the laboratory . Which of the following statement(s) is(are) correct about the reaction?

It is a decomposition reaction and endothermic in nature
It is a photochemical decomposition reaction and endothermic in nature
It is a photochemical decomposition reaction and exothermic in nature
It is a decomposition reaction and accompanied by release of heat
It is a combination reaction

2. Which of the following are combination reactions?

\(MgO\) + \(H_2O\) → \(Mg(OH)_2\)
\(2H_2S\) + \(3O_2\) → \(2H_2O\) + \(2SO_5\)
\(4Al\) + \(3O_2\) → \(2Al_2O_3\)
\(Zn\) + \(FeSO_4\) → \(ZnSO_4\) + \(Fe\)
\(2KClO_3\) → \(2KCl\) + \(3O_2\)

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