Question

Simplified absorption spectra of three complexes $((i), (ii)$ and $(iii))$ of $M ^{ n +}$ ion are provided below; their $\lambda_{\max }$ values are marked as $A, B$ and $C$ respectively. The correct match between the complexes and their $\lambda_{\max }$ values is :

(i) $\left[ M ( NCS )_{6}\right]^{(-6+ n )}$
(ii) $\left[ MF _{6}\right]^{(-6+n)}$
(iii) $\left[ M \left( NH _{3}\right)_{6}\right]^{ n +}$

• A. $A -( ii ), B -( i ), C -( iii )$
• B. $A -( iii ), B -( i ), C -( ii )$
• C. $A -( ii ), B -( iii ), C -( i )$
• D. $A -( i ), B -( ii ), C -( iii )$

Answer 1

Answer: (B)

Strength of ligand $F ^{-}< NCS ^{-}< NH _{3}$



As given in graph $: A< B< C\left(\lambda_{\max }\right)$

$\therefore $ Correct matching is $A -( iii ), B -( i ), C -( ii )$