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