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NEETChemistryd and f Block Elements

Identify the INCORRECT pairing of a 3 d series metal's unique property and the magnetic characteristic of its specified ion.

Options

  1. AZinc: Not considered a transition metal; its +2 ion is diamagnetic.
  2. BScandium: Does not show variable oxidation states; its +3 ion is diamagnetic.
  3. CCopper: Its +1 ion undergoes disproportionation in aqueous solution; its +2 ion is paramagnetic.
  4. DManganese: Shows the maximum number of oxidation states in the 3 d series; its +2 ion has 4 unpaired electrons

Correct answer

D. Manganese: Shows the maximum number of oxidation states in the 3 d series; its +2 ion has 4 unpaired electrons

Step-by-step solution

Option 1 is a correct pairing: Zinc ( 3 d ¹⁰ 4 s ² ) is not considered a transition metal because it has completely filled d-orbitals in its ground state and its common +2 oxidation state. The Zn ²⁺ ion ( 3 d ¹⁰ ) has no unpaired electrons and is diamagnetic. Option 2 is a correct pairing: Scandium only shows a +3 oxidation state and does not exhibit variable oxidation states. The Sc ³⁺ ion ( 3 d ⁰ ) is diamagnetic. Option 3 is a correct pairing: Copper(I) undergoes disproportionation in aqueous solution ( 2 Cu ⁺ C

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