Assertion : $N_{2}$ molecule is highly unreactive. Reason: $_{∙}^{∙} N ⋮ ⋮ N_{∙}^{∙}, N_{2}$ is unreactive since, bond energy is very high.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
$N_{2}$ is unreactive because it requires a huge amount of energy to break the bonds. Since chemical reactions occur readily when old bonds break to form new and stronger bonds
In a nitrogen molecule, there exists a triple bond between the two nitrogen atoms due to which, the bond energy is very high ( 945.4 kJ/mol). Hence, nitrogen is apparently inactive under normal conditions.

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Assertion :N2 molecule is highly unreactive. Reason: ∙∙N⋮⋮N∙∙,N2 is unreactive since, bond energy is very high.

Assertion : $N_{2}$ molecule is highly unreactive. Reason: $_{∙}^{∙} N ⋮ ⋮ N_{∙}^{∙}, N_{2}$ is unreactive since, bond energy is very high.