Which ion would be expected to be colourless in aqueous solution?
Correct answer: C. Zn2+
- A. Fe3+
- B. Cu2+
- C. Zn2+
- D. Ni2+
Explanation
The zinc ion has a completely filled 3d10 configuration, so no d to d electronic transition is possible and no visible light is absorbed. Iron three, copper two and nickel two all have partly filled d subshells and give yellow brown, blue and green solutions respectively. Scandium three, being 3d0, is colourless for the complementary reason.
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About Electronic Structure of d-Block Elements
The electronic structure of d-block elements covers the filling of the (n-1)d and ns orbitals, general electronic configurations, and the exceptions shown by chromium and copper. It explains how partially filled d orbitals produce variable oxidation states, coloured ions, magnetic behaviour and complex formation, while distinguishing transition elements from elements with completely filled d subshells.
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