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NEET CHEMISTRYChemical Bonding and Molecular StructureMedium

Question

Which one of the following statements is correct?

A

BF3_3 has non-zero dipole moment.

B

The dipole moment of NF3_3 is greater than that of NH3_3.

C

Three canonical forms can be drawn for CO32−_3^{2-} ion.

D

Three resonance structures can be drawn for ozone.

Step-by-Step Solution

  1. Analyze Option A (BF3BF_3): BF3BF_3 has a symmetrical trigonal planar geometry. The resultant of two B-F bond moments is equal and opposite to the third B-F bond moment, resulting in a net dipole moment of zero .
  2. Analyze Option B (NH3NH_3 vs NF3NF_3): In NH3NH_3, the orbital dipole due to the lone pair is in the same direction as the resultant of the three N-H bond moments, reinforcing the effect. In NF3NF_3, the orbital dipole is in the direction opposite to the resultant of the three N-F bond moments. Consequently, the dipole moment of NH3NH_3 (1.47 D) is greater than that of NF3NF_3 (0.23 D) .
  3. Analyze Option C (CO32−CO_3^{2-}): The carbonate ion is resonance stabilized. Experimental findings show all C-O bonds are equivalent. This is described by three equivalent canonical forms where the double bond is delocalized over the three oxygen atoms .
  4. Analyze Option D (Ozone): The ozone molecule (O3O_3) is represented by two canonical forms (resonance structures) to explain the equality of its bond lengths .

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Chemical Bonding and Molecular Structure. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYChemical Bonding and Molecular Structurefollowingstatementscorrect

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