An element is placed in the 2nd group and 3rd period of the modern periodic table, burned in the presence of oxygen to form a basic oxide. The product formed when it burns in the presence of air is

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MgO2

Mg2O2

MgO

Mg2O

answer is C.

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Detailed Solution

The product formed when it burns in the presence of air is MgO.
Electronic configuration of Mg = 2, 8, 2. It has 2 valence electrons, so it loses them to attain noble gas configuration and act as a metal. All the metals when react with oxygen in air forms basic oxides. Here, when Mg reacts with oxygen it yields magnesium oxide (MgO).
2Mg (s) + O2 (g) → 2MgO (s)

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