Neco 2025 Chemistry Question 23

Practice objective / multiple choice question 23 from the 2025 Neco Chemistry examination.

Neco 2025 Chemistry Objective / Multiple Choice Medium Difficulty
Question 23 NECO • 2025 • CHEMISTRY • objective

Consider a molecule AB_{3}C in which the central atom A is bonded to three identical atoms B and possesses one lone pair. The measured bond angle between the A-B bonds is 107^{\circ}. (i) State the electron‑pair geometry and the molecular geometry of AB_{3}C. (ii) Indicate the hybridisation of the central atom A. (iii) Explain why the observed bond angle is smaller than the ideal tetrahedral angle.

Answer Options

A. Electron‑pair geometry: tetrahedral; Molecular geometry: tetrahedral; Hybridisation: sp^{3}; The lone pair exerts greater repulsion, compressing the bond angles to about 107^{\\circ}.
B. Electron‑pair geometry: tetrahedral; Molecular geometry: trigonal pyramidal; Hybridisation: sp^{2}; The lone pair exerts greater repulsion, compressing the bond angles to about 107^{\\circ}.
Correct Answer C. Electron‑pair geometry: tetrahedral; Molecular geometry: trigonal pyramidal; Hybridisation: sp^{3}; The lone pair exerts greater repulsion, compressing the bond angles to about 107^{\circ}.
D. Electron‑pair geometry: trigonal planar; Molecular geometry: trigonal pyramidal; Hybridisation: sp^{2}; The lone pair exerts greater repulsion, compressing the bond angles to about 107^{\\circ}.
Correct Answer
C
Correct Option:
Electron‑pair geometry: tetrahedral; Molecular geometry: trigonal pyramidal; Hybridisation: sp^{3}; The lone pair exerts greater repulsion, compressing the bond angles to about 107^{\circ}.

About This Question

This is Neco 2025 Chemistry Question 23. It is one of the objective questions from the 2025 Neco Chemistry examination.

Difficulty level: Medium .

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