Chemistry Chemical Bonding DUHS 2024
PMDC Verified Question 15 of 102
This shape is found in \( \text{AX}_2 \) when the bond angle is 180°:
A
Linear
B
Bent
C
Triangle
D
Tetrahedral
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Linear
Concept:

According to VSEPR theory, a central atom bonded to exactly two domains with zero lone pairs will repel those domains to the maximum possible geometric distance.

Formula:

$$ \text{Maximum angle for 2 domains} = \frac{360^{\circ}}{2} = 180^{\circ} $$

Solution:

  • If molecule type is \( \text{AX}_2 \) (or \( \text{AB}_2 \)) and has a bond angle of exactly 180°, the atoms are arranged in a straight line.


  • This geometry is formally called Linear (e.g., \( \text{BeCl}_2 \), \( \text{CO}_2 \)).


Why other options are incorrect:

  • Option B: Bent shapes occur when lone pairs push the bonds closer together (angles < 180°).
  • Option C & Option D: Correspond to 3 and 4 bonding domains, respectively.

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.

Previous Question All Chemical Bonding MCQs Next Question

Want to solve full-length papers under timed exam conditions?

Practice with zero-scroll lockdown sprints, dynamic latency zone timers, live peer selection telemetry, and the automated Amber mistake recovery loop.

Enter Arena Sprint iOS App Android App