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y is N2 inert at room temp. ?

There is triple bond between two nitrogen atom in N2 molecule.It needs a large amount of energy to break a triple bond. Therefore N2 is inert or not reactive at room temperature.

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Nitrogen has five electrons in its outer shell and is therefore trivalent in most compounds. The triple bond in molecular nitrogen (N2) is one of the strongest in nature, making it relatively inert at room temperature and standard pressure. The resulting difficulty of converting (N2) into other compounds, and the ease (and associated high energy release) of converting nitrogen compounds into elemental N2, have dominated the role of nitrogen in both nature and human economic activities.

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Inert is a term that is used to describe a substance which is very stable and not reactive. For example we often say that metals like gold, platinum, silver are inert. It means that these metals are highly unreactive.

Nitrogen gas exists as molecule of dinitrogen (N2) and the amount of energy required to break the bond between the two nitrogen atoms in Dinitrogen is very high, therefore, it does not react easily at room temperature.This is why nitrogen (N2) gas is chemically inert.
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N2 is inert at room temp becoz strong p^-p^ overlap resulting into the triple bond , consequently high bond enthalpy

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