Neco Model Questions Vol1 2020 Chemistry Question 17

Practice objective / multiple choice question 17 from the 2020 Neco Model Questions Vol1 Chemistry examination.

Neco Model Questions Vol1 2020 Chemistry Objective / Multiple Choice Medium Difficulty
Question 17 NECO_MODEL_QUESTIONS_VOL1 • 2020 • CHEMISTRY • objective

A diatomic molecule AB has a measured bond length of 150 pm and a dipole moment of 2.5 D. The electronegativities of A and B are 2.1 and 3.5 respectively. (i) Calculate the fractional ionic character of the A-B bond using the relation \( \mu = \delta \; d\), where \( \mu\) is the dipole moment, \( d\) is the bond length expressed in meters, and \( \delta\) is the effective charge in coulombs. (ii) Estimate the percent ionic character from Pauling's equation \( \%\text{ionic}=\bigl(1-e^{-0.25(\Delta\chi)^2}\bigr)\times100\). (iii) Compare the two percentages and comment on the nature of the bond.

Answer Options

A. ≈28.9 % from dipole data; ≈40.1 % from Pauling's equation; the bond is moderately polar with mixed covalent‑ionic character.
B. ≈36.0 % from dipole data; ≈35.0 % from Pauling's equation; the bond is moderately polar with mixed covalent‑ionic character.
Correct Answer C. ≈34.7 % from dipole data; ≈38.7 % from Pauling's equation; the bond is moderately polar with mixed covalent‑ionic character.
D. ≈30.2 % from dipole data; ≈42.5 % from Pauling's equation; the bond is moderately polar with mixed covalent‑ionic character.
Correct Answer
C
Correct Option:
≈34.7 % from dipole data; ≈38.7 % from Pauling's equation; the bond is moderately polar with mixed covalent‑ionic character.

About This Question

This is Neco Model Questions Vol1 2020 Chemistry Question 17. It is one of the objective questions from the 2020 Neco Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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