Q114 · CSIR-NET Chemistry, December 2013

Paper: CSIR-NET December 2013 · Subject: Physical Chemistry · Chapter: Statistical Thermodynamics · Topic: Partition Functions · Marks: 2 · Difficulty: Medium

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

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

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

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

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

Answer

Answer: D ✓ checked by 4AB · confidence high

The source book printed C; on checking, D is correct — see the explanation.

Explanation

N₂⁺ loses an electron from 3σg (σ2p), leaving (3σg)¹: ²Σg⁺ (d).

Study loop for Statistical Thermodynamics