Home Chemistry Solid State NTA Abhiyas Question For [FeF 6 ] 3- and [CoF 6 ] 3- , the correc…
Chemistry Solid State NTA Abhiyas Question Single Correct MCQ
Published on: August 11, 2026

For [FeF 6 ] 3- and [CoF 6 ] 3- , the correct statement is

A
both are coloured
B
both are colourless
C
[FeF 6 ] 3- coloured and [CoF 6 ] 3- is colourless
D
[FeF 6 ] 3- colourless and [CoF 6 l 3- is coloured

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Text Solution

Verified by Experts
The correct answer is:
D

[FeF 6 ] 3- is colourless and [CoF 6 ] 3- is coloured

In [CoFe] 3- it absorbs red colour light so it shows complementary colour green, while in the case of [FeFe 6 ] 3- there is very weak splitting so the light absorbed will be in infrared region so its complementary colour is not in visible region of light hence it appears colourless.

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