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COMEDK2020Chemistryd and f Block Elements

Which of the following forms a colourless solution in aqueous medium? @@

Options

  1. ATi ³⁺
  2. BSc ³⁺
  3. CV ³⁺
  4. DCr ³⁺

Correct answer

B. Sc ³⁺

Step-by-step solution

The electronic configuration of Sc is 1 s⁸ 2 s⁸ 2 p⁶ 3 s² 3 p⁶ 3 d¹ 4 s² Electronic configuration of Sc ³⁺ is 1 s² 2 s² 2 p⁶ 3 s² 3 p⁶ . So , Sc ³⁺ is colourless due to the absence of unpuired electrons in d -orbital.

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