Question

Which of the following are combination reactions?

1. `2"KClO"_3 overset("Heat")(->) 2"KCl" + 3"O"_2`
2. `"MgO" + "H"_2"O" -> "Mg"("OH")_2`
3. `4"Al" + 3"O"_2 -> 2"Al"_2"O"_3`
4. `"Zn" + "FeSO"_4 -> "ZnSO"_4 + "Fe"`

Options

• (i) and (iii)

• (iii) and (iv)

• (ii) and (iv)

• (ii) and (iii)

Answer 1

(ii) and (iii)

Explanation - 

Both the reactions (ii) and (iii) are the examples of combination reactions.