Which of the following are combination reactions?

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Potassium chlorate is heated.

Magnesium oxide reacts with water.

Aluminium reacts with oxygen

Both 2 and 3

answer is D.

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Detailed Solution

When magnesium oxide reacts with water and aluminium reacts with oxygen, a combination reaction takes place.
Magnesium combines with water to produce magnesium hydroxide. The reaction that takes place is
Mg + H2O → Mg(OH)2
Aluminium combines with water to produce aluminium oxide. The reaction that takes place is
4Al + 3O2 → 2Al2O3

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