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JEE Main202229 Jul 2022Morning ShiftChemistryd and f Block ElementsActual

In following pairs, the one in which both transition metal ions are colourless is

Options

  1. ASc 3 + , Zn 2 +
  2. BTi 4 + , Cu 2 +
  3. CV 2 + , Ti 3 +
  4. DZn 2 + , Mn 2 +

Correct answer

A. Sc 3 + , Zn 2 +

Step-by-step solution

d -block elements form coloured ions due to presence of unpaired electrons in them. since there are no unpaired electrons in Sc 3 + and Zn 2 + ions, they are colourless. No of unpaired e - Ti 3 + - [ Ar ] 3   d 1 , Cu 2 + - [ Ar ] 3   d 9 Sc 3 + - [ Ar ] 3   d 0 , Zn 2 + - [ Ar ] 3   d 10   T i 4 + - [ Ar ] 3   d 0         V 2 + - [ Ar ] 3   d 3   , No d-d transitions in ions with d 0 & d 10 configuration. Therefore they are colourless.

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