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From the ions listed below, which pair has geometries that can be accounted for by the same type of orbital hybridization? NO₂⁻, NO₃⁻, NH₂⁻, NH₄⁺, SCN⁻

1. NO₂⁻ and NO₃⁻
2. NH₂⁻ and NO₃⁻
3. SCN⁻ and NH₂⁻
4. NO₂⁻ and NH₄⁺

Correct answer: NO₂⁻ and NO₃⁻

Solution

Both NO₂⁻ and NO₃⁻ exhibit geometries that can be explained by sp² hybridization. In NO₂⁻, the central nitrogen atom forms one double bond and one single bond, leading to a bent shape, while in NO₃⁻, the nitrogen forms three equivalent bonds with oxygen, resulting in a trigonal planar geometry, both of which are consistent with sp² hybridization.

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