The formation of magnesium oxide (MgO) from magnesium and oxygen is a/an _____ reaction.
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A.
combination
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B.
endothermic
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C.
displacement
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D.
neutralisation
Correct Answer:
A. combination
Explanation:
The formation of magnesium oxide (MgO) from magnesium and oxygen is categorized as a combination reaction. In this process, two distinct reactants—solid magnesium and gaseous oxygen—chemically bond to form a single, more complex product, magnesium oxide ($2Mg + O_{2} \rightarrow 2MgO$). This reaction is also highly exothermic because it releases a significant amount of energy in the form of intense white light and heat. Since the primary characteristic is the synthesis of one compound from multiple elements, it is fundamentally a combination (or synthesis) reaction.
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