Identify the correct answer. (1) Three resonance structures can be drawn for ozone (2) BF3 has non-z

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Question

Identify the correct answer. (1) Three resonance structures can be drawn for ozone (2) BF3 has non-zero dipole moment (3) Dipole moment of NF3 is greater than that of NH3 (4) Three canonical forms can be drawn for CO3^{2-} ion

Accepted Answer

Correct Answer: d — Three canonical forms can be drawn for CO3^{2-} ionStep-by-step Solution:Let's evaluate each statement:(1): Ozone (O₃) has two equivalent resonance structures, not three. The central O forms a double bond with one terminal O and a single bond with the other, and the double bond can be on either side. Hence, only two resonance structures. So false.(2): BF₃ is trigonal planar and symmetric. The three B–F bond dipoles cancel each other, resulting in zero net dipole moment. So false.(3): In NH₃, the net dipole moment is high (1.47 D) because the lone pair on N contributes in the same direction as the N–H bond dipoles. In NF₃, the lone pair dipole opposes the bond dipoles (F is more electronegative than N, so bond dipoles point towards F), resulting in a lower net dipole (0.24 D). Thus, dipole moment of NF₃ is less than that of NH₃. So false.(4): The carbonate ion (CO₃²⁻) is a resonance hybrid of three equivalent canonical structures, each with one C=O double bond and two C–O⁻ single bonds. So true.Thus, only statement (4) is correct.Key Concepts: Resonance in ozone and carbonate, dipole moment in symmetrical molecules (BF₃), comparison of dipole moments in NH₃ and NF₃ (role of lone pair direction).

Identify the correct answer. (1) Three resonance structures can be drawn for ozone (2) BF3 has non-zero dipole moment (3) Dipole moment of NF3 is greater than that of NH3 (4) Three canonical forms can be drawn for CO3^{2-} ion

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Identify the correct answer. (1) Three resonance structures can be drawn for ozone (2) BF3 has non-zero dipole moment (3) Dipole moment of NF3 is greater than that of NH3 (4) Three canonical forms can be drawn for CO3^{2-} ion

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