Explanation:
Nitrogen shows covalency of 4 by coordinate bonding when it donates ns-electron pair to Lewis acid. So, statement 2 is correct.Nitrogen exhibits the oxidation state ranging from -3 in ammonia and +5 in Nitric Acid. So, statement 1 is incorrect.Since Nitrogen has no d-orbitals, it cannot undergo sp3 hybridization. So, statement 3 is incorrect.Nitrogen forms oxides within the range to +5. So, statement 4 is incorrect.Hence, the correct option is (B).