Medium MCQ +4 / -1 PYQ · JEE Mains 2023

Consider the following statements:

(A) NF3 molecule has a trigonal planar structure.

(B) Bond length of $\mathrm{N}_{2}$ is shorter than $\mathrm{O}_{2}$.

(C) Isoelectronic molecules or ions have identical bond order.

(D) Dipole moment of $\mathrm{H}_{2}\mathrm{S}$ is higher than that of water molecule.

Choose the correct answer from the options given below:

  1. A (C) and (D) are correct
  2. B (A) and (B) are correct
  3. C (B) and (C) are correct Correct answer
  4. D (A) and (D) are correct

Solution

The correct answer is (B) and (C). <br/><br/> (A) NF<sub>3</sub> molecule has a trigonal pyramidal structure, not a trigonal planar structure. Therefore, statement (A) is false. <br/><br/> (B) The bond length of $\mathrm{N}_{2}$ is shorter than that of $\mathrm{O}_{2}$ due to the smaller atomic radius of nitrogen compared to oxygen. Therefore, statement (B) is true. <br/><br/> (C) Isoelectronic molecules or ions have the same number of electrons and hence the same bond order. Therefore, statement (C) is true. <br/><br/> (D) The dipole moment of water ($\mathrm{H}_{2}\mathrm{O}$) is higher than that of $\mathrm{H}_{2}\mathrm{S}$ due to the greater electronegativity of oxygen compared to sulfur. Therefore, statement (D) is false.

About this question

Subject: Chemistry · Chapter: Chemical Bonding and Molecular Structure · Topic: Ionic and Covalent Bonding

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