Chemistry Chemical Bonding NUMS 2019
PMDC Verified Question 76 of 102
For formation of ionic bond, electronegativity difference should be:
A
Equal to zero
B
Equal to 0.5
C
More than 1.7
D
Less than 1.7
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: More than 1.7
Concept:

The nature of a bond (ionic vs. covalent) is determined by the difference in electronegativity (\( \Delta \text{EN} \)) between the two bonding atoms.

Formula:

$$ \Delta \text{EN} > 1.7 \implies \text{Ionic Bond predominantly} $$

Solution:

  • If the difference is greater than 1.7, the more electronegative atom will effectively strip the electron completely away from the less electronegative atom, forming ions.


  • This results in electrostatic attraction, forming an ionic bond (usually >50% ionic character).


Why other options are incorrect:

  • Option A & Option B: Indicate non-polar covalent bonds (equal or nearly equal sharing).
  • Option D: Represents a polar covalent bond, where electrons are shared unequally but not fully transferred.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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