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12 grade chemistry others

If color of [Ni({H₂O)₂(en)₂}]²⁺ is blue-purple then what would be the color of [Ni(en)₃]²⁺?

(a) Green

(b) Pale blue

(c) Deep blue

(d) Violet

Aniket Singh

1 Year agoGrade

1 Answer

Askiitians Tutor Team

Approved Tutor Answer1 Year ago

The color of coordination complexes can vary significantly based on their ligands and the geometry of the complex. In the case of [Ni({H₂O)₂(en)₂}]²⁺, which exhibits a blue-purple color, the presence of water and ethylenediamine (en) ligands influences its hue.

Analyzing [Ni(en)₃]²⁺

For the complex [Ni(en)₃]²⁺, ethylenediamine is a stronger field ligand compared to water. This means it can cause greater splitting of the d-orbitals in the nickel ion, which typically results in a different color.

Expected Color Change

Stronger Field Ligands: Ethylenediamine is a bidentate ligand that creates a more stable and differently colored complex.
Color Shift: The transition from a blue-purple to a different hue is likely due to the increased ligand field strength.

Based on these factors, the color of [Ni(en)₃]²⁺ is expected to be deep blue. Therefore, the correct answer is (c) Deep blue.

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