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NTA Abhyas JEE Main2020Chemistryd and f Block ElementsPractice

Compound that is both paramagnetic and coloured is

Options

  1. AK 2 Cr 2 O 7
  2. B(NH 4 ) 2 [TiCl 6 ]
  3. CVOSO 4
  4. DK 3 [Cu(CN) 4 ]

Correct answer

C. VOSO 4

Step-by-step solution

K 2 Cr 2 O 7 contains Cr +6 (3d 0 ) which is diamagnetic but coloured due to charge transfer spectra. (NH 4 ) 2 [TiCl 6 ] contains Ti 4+ (3d 0 ), which is diamagnetic and colourless. VOSO 4 contains V 4+ (3d 1 ), which is paramagnetic and coloured. K 3 [Cu(CN) 4 ] contains Cu + (3d 10 ), which is diamagnetic and colourless.

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