Match List I with List II
| List I Coordination entity |
List II Wavelength of light absorbed in nm |
||
|---|---|---|---|
| A. | $\mathrm{[CoCl(NH_3)_5]^{2+}}$ | I. | 310 |
| B. | $\mathrm{[Co(NH_3)_6]^{3+}}$ | II. | 475 |
| C. | $\mathrm{[Co(CN)_6]^{3-}}$ | III. | 535 |
| D. | $\mathrm{[Cu(H_2O)_4]^{2+}}$ | IV. | 600 |
Choose the correct answer from the options given below :
Solution
<p>Co-ordination compounds absorb a particular wavelength following certain rules.</p>
<p> $$
\begin{aligned}
\text{Wavelength of light absorbed} & \propto \frac{1}{\text { Oxidation state of metal ion }} \\\\
& \propto \frac{1}{\text { Strength of ligand }}
\end{aligned}
$$</p>
<p>Ligand field strength : $\mathrm{CN}^{-}>\mathrm{NH}_{3}>\mathrm{H}_{2} \mathrm{O}>\mathrm{Cl}^{-}$</p>
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<table class="tg">
<thead>
<tr>
<th class="tg-0pky">C.</th>
<th class="tg-0pky">$\left[\mathrm{Co}^{||||}(\mathrm{CN})_{6}\right]^{3-}$</th>
<th class="tg-0pky">I.</th>
<th class="tg-0pky">$310 \mathrm{~nm}$</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tg-0pky">B.</td>
<td class="tg-0pky">$\left[\mathrm{Co}^{||||}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}$</td>
<td class="tg-0pky">II.</td>
<td class="tg-0pky">$475 \mathrm{~nm}$</td>
</tr>
<tr>
<td class="tg-0pky">A.</td>
<td class="tg-0pky">$\left[\mathrm{Co}^{||||}\mathrm{Cl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{2+}$</td>
<td class="tg-0pky">III.</td>
<td class="tg-0pky">$535 \mathrm{~nm}$</td>
</tr>
<tr>
<td class="tg-0pky">D.</td>
<td class="tg-0pky">$\left[\mathrm{Co}^{||}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}\right]^{2+}$</td>
<td class="tg-0pky">IV.</td>
<td class="tg-0pky">$600 \mathrm{~nm}$</td>
</tr>
</tbody>
</table></p>
About this question
Subject: Chemistry · Chapter: Coordination Compounds · Topic: Ligands and Coordination Number
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