Q44 · CSIR-NET Chemistry, June 2019

Paper: CSIR-NET June 2019 · Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Term Symbols Spectra · Marks: 2 · Difficulty: Easy

The term symbol for the ground state of dinitrogen cation radical $\left(\mathrm{N}_{2}\right)^{+}$is

(a)${ }^{2} \pi_{\mathrm{u}}$

(b)${ }^{2} \sum_{\mathrm{u}}^{-}$

(c)${ }^{2} \pi_{\mathrm{g}}$

(d)${ }^{2} \sum_{\mathrm{g}}^{+}$

Answer

Answer: D ✓ checked by 4AB · confidence high

Explanation

N₂ is (σ_g2s)²(σ_u*2s)²(π_u2p)⁴(σ_g2p)²; removing one electron from the σ_g HOMO gives N₂⁺ with the ²Σg⁺ ground state.

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