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Q.

A strip of magnesium ribbon is heated over a flame for a while. It is observed that the magnesium ribbon burns with a dazzling flame and turns into a white substance known as magnesium oxide. Which of the following equations correctly represents the described reaction?

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a

Mg + O2 → MgO2

b

2Mg + O2 → 2MgO

c

2Mg + 2O2 → 2MgO

d

Mg + 2O2 → 2MgO2

answer is C.

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Detailed Solution

When a metal is burnt in air, it reacts with oxygen to form oxides. In the given reaction, when magnesium is burnt in air, it combines with air to form magnesium oxide, MgO.

The equation given in this alternative correctly represents this reaction.
    2Mg (s)   +   O2 (g)  → 2MgO (s)
Magnesium    Oxygen    Magnesium oxide    

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A strip of magnesium ribbon is heated over a flame for a while. It is observed that the magnesium ribbon burns with a dazzling flame and turns into a white substance known as magnesium oxide. Which of the following equations correctly represents the described reaction?