Chemistry S & P Block Elements DUHS 2023
PMDC Verified Question 43 of 104
Which of the following substance is malleable and ductile?
A
Sodium chloride
B
Copper sulphate
C
Mercury
D
Aluminum
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Aluminum
Concept:

Malleability (ability to be hammered into sheets) and ductility (ability to be drawn into wires) are hallmark physical properties of solid metals.

Solution:

  • Sodium chloride & Copper sulphate: These are ionic crystals. Ionic bonds are highly directional and rigid. If struck, the lattice shifts, bringing like-charges together, which repel and shatter the crystal. They are brittle, not malleable.
  • Mercury: Is a pure metal, but it is a liquid at room temperature. You cannot hammer a liquid into a sheet or draw it into a wire.
  • Aluminum: Is a solid metal at room temperature. Its atoms are bonded via a "sea of delocalized electrons" (metallic bonding). When physical force is applied, the metal cations simply slide past each other while the flexible electron sea keeps the bond intact. Thus, Aluminum is highly malleable and ductile.


Why other options are incorrect:

  • Only a solid metal can possess the properties of malleability and ductility.

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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