Consider the metal complexes $\left[\mathrm{Ni}(\mathrm{en})_3\right]^{2+}(\mathrm{A}),\left[\mathrm{NiCl}_4\right]^{2-}(\mathrm{B})$ and $\left[\mathrm{Ni}\left(\mathrm{NH}_3\right)_6\right]^{2+}(\mathrm{C})$. Choose the CORRECT option by considering the number of unpaired electrons present in (A), (B) and (C) respectively and the order of frequency of absorption.
$$ \text { Match the LIST-I with LIST-II } $$
| List-I Complex ion |
List-II Calculated spin only magnetic moment (BM) |
||
|---|---|---|---|
| A. | $$ \left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+} $$ |
I. | 3.87 |
| B. | $$ \left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+} $$ |
II. | 5.92 |
| C. | $$ \left[\mathrm{Cu}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+} $$ |
III. | 4.90 |
| D. | $$ \left[\mathrm{Mn}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+} $$ |
IV. | 1.73 |
Choose the correct answer from the options given below :
Given below are two statements :
Statement I : Among Zn, Mn, Sc and Cu, the energy required to remove the third valence electron is highest for Zn and lowest for Sc.
Statement II : The correct order of the following complexes in terms of CFSE is $[\text{Co(H}_2\text{O})_6]^{2+} < [\text{Co(H}_2\text{O})_6]^{3+} < [\text{Co(en)}_3]^{3+}$.
In the light of the above statements, choose the correct answer from the options given below :
Which of the following complexes will show coordination isomerism?
A. $[\mathrm{Ag(NH}_3)_2][\mathrm{Ag(CN)}_2]$
B. $[\mathrm{Co(NH}_3)_6][\mathrm{Cr(CN)}_6]$
C. $[\mathrm{Co(NH}_3)_6][\mathrm{Co(CN)}_6]$
D. $[\mathrm{Fe(NH}_3)_6][\mathrm{Co(CN)}_6]$
E. $[\mathrm{Co(NH}_3)_6][\mathrm{Fe(CN)}_6]$
Choose the correct answer from the options given below:
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