Among the following, the isoelectronic and isostructural pair is · ABC26IN0320
Subject: Inorganic Chemistry · Chapter: Chemical Bonding · Topic: MO Theory Diatomics · Exam: GATE 2005-2021 · Marks: 2 · Difficulty: Easy
Among the following, the isoelectronic and isostructural pair is
(a)$\mathrm{CO_2}$ and $\mathrm{SO_2}$
(b)$\mathrm{SO_3}$ and $\mathrm{SeO_3}$
(c)$\mathrm{NO_2^{+}}$ and $\mathrm{TeO_2}$
(d)$\mathrm{SiO_4^{4-}}$ and $\mathrm{PO_4^{3-}}$
Answer
Answer: D ✓ checked by 4AB · confidence high
The source book printed B; on checking, D is correct — see the explanation.
Explanation
SiO₄⁴⁻ and PO₄³⁻ both have 50 electrons and both are tetrahedral. SO₃/SeO₃ and CO₂/SO₂ are not isoelectronic, and NO₂⁺ is linear while TeO₂ is bent (d).