Chemistry S & P Block Elements ETEA 2022
PMDC Verified Question 55 of 104
All alkaline metals are white in colour except
A
Beryllium
B
Magnesium
C
Calcium
D
Strontium
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Beryllium
Concept:

Alkaline earth metals (Group II-A) generally exhibit a silvery-white metallic appearance, but the lightest member has a distinct physical look.

Solution:

  • Most alkaline earth metals (like Mg, Ca, Sr, Ba) are relatively soft, silvery-white metals.
  • Beryllium (Be), being at the very top of the group, has an anomalously small atomic size and a tightly packed, strong metallic lattice.
  • Because of this unique structure, Beryllium appears as a hard, brittle, steel-gray metal rather than silvery-white.


Why other options are incorrect:

  • Magnesium, Calcium, and Strontium all fit the general group characteristic of being silvery-white metals.

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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