Chemistry Transition Elements UHS 2024
PMDC Verified Question 3 of 68
Which of the following is NOT a property of transition elements?
A
High melting points
B
Hard metals
C
Good conductors of electricity
D
Ions and compounds are colourless
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Ions and compounds are colourless
Concept:

Transition metals are characterized by having partially filled \(d\)-subshells, which leads to a unique set of physical and chemical properties.

Solution:

  • Due to strong metallic bonding involving both \(s\) and \(d\) electrons, they are hard metals with high melting points.


  • Like all metals, they possess a sea of delocalized electrons, making them good conductors of electricity.


  • However, because they have partially filled \(d\)-orbitals, electrons can undergo \(d-d\) transitions by absorbing specific wavelengths of visible light.


  • As a result, most transition metal ions and compounds are highly coloured.


Why other options are incorrect:

  • Since transition metal compounds are famously colorful (e.g., blue copper sulfate, purple potassium permanganate), the statement that they are "colourless" is factually false.

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