Verified Solution • 2025–26 Session moderate

QJEEM21Ch3133: JEE Main 2021 Chemistry - Class 12 JEEM21Ch3133 Solution: The correct order of intensity of colors of the compounds is :

The correct order of intensity of colors of the compounds is :

Multiple Choice Options

  • A [Ni(CN)4]2−>[NiCl4]2−>[Ni(H2O)6]2+
  • B [Ni(H2O)6]2+>[NiCl4]2−>[Ni(CN)4]2−
  • C [NiCl4]2−>[Ni(H2O)6]2+>[Ni(CN)4]2−
  • D [NiCl4]2−>[Ni(CN)4]2−>[Ni(H2O)6]2+

Step-by-Step Verified Solution

Correct order of intensity of colours of the compounds is

[NiCl4]2− > [Ni(H2O)6]2+ > [Ni(CN)4]2−

Ni is in +2 oxidation state in all complexes. The intensity of colour depends on the strength of the ligand attached with the central metal atom because more strong ligand more splitting energy, less is intensity of colour. Strength of ligand is in the order CN− > H2O > Cl−.

Splitting energy order [NiCl4]2− < [Ni(H2O)6]2+ < [Ni(CN)4]2−

∴ Intensity of colour of compound

[NiCl4]2− > [Ni(H2O)6]2+ > [Ni(CN)4]2−

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