Match List I with List II List I Coordination entity List II Wavelength of light absorbed in nm A [CoCl ( NH _ 3 ) _ 5 ] ^ 2 + I. 310 B [Co ( NH _ 3 ) _ 6 ] ^ 3 + II. 475 C [Co ( CN ) _ 6 ] ^ 3 - III. 535 D [Cu ( H _ 2

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Quantrex Academy · Accepted Answer

Correct answer: B. A - III, B - II, C - I, D - IV

Co-ordination compounds absorb a particular wavelength following certain rules.

$\text{Wavelength of light absorbed} ∝ \dfrac{1}{\text{Oxidation state of metal ion}}$

$∝ \dfrac{1}{\text{Strength of ligand}}$

Ligand field strength - ${CN}^{-} > {NH}_{3} > {H}_{2}O > {Cl}^{-}$

	List I Coordination entity		List II Wavelength of light absorbed in nm
A	${\left[CoCl{\left({NH}_{3}\right)}_{5}\right]}^{2 +}$	I.	$535$
B	${\left[Co{\left({NH}_{3}\right)}_{6}\right]}^{3 +}$	II.	$475$
C	${\left[Co ( CN{)}_{6}\right]}^{3 -}$	III.	$310$
D	${\left[Cu{\left({H}_{2}O\right)}_{4}\right]}^{2 +}$	IV.	$600$

Match List I with List II List I Coordination entity List II...

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