(Sections 28.5, 28.6)
(a) Rank the following manganese complexes in order of increasing $\triangle$. Explain your reasoning.
\begin{tabular}{cccc} {$\left[\mathrm{Mn}\left(\mathrm{NH}_{3}\right) \mathrm{B}\right]^{2+}$} & {$\left[\mathrm{MnCl}_{4}\right]^{2-}$} & {$\left[\mathrm{Mn}(\mathrm{CN})_{\mathrm{B}}\right]^{4-}$} & {$\left[\mathrm{Mn}(\mathrm{CN})_{B}\right]^{3}$} \\ \hline \end{tabular}
(b) Rank the following manganese complexes in order of increasing intensity of colour. Explain your reasoning.
\begin{tabular}{cccc} {$\left[\mathrm{MnO}_{4}\right]^{-}$} & {$\left[\mathrm{Mn}\left(\mathrm{NH}_{3}\right) \mathrm{B}\right]^{2+}$} & {$\left[\mathrm{MnCl}_{4}\right]^{-}$} & {$\left[\mathrm{Mn}(\mathrm{CN})_{0}\right]^{3}$} \\ \hline \end{tabular}

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Chemistry 102

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Chemistry $^{3}$ : Introducing inorganic, organic and physical chemistry

Chapter 28

d-Block chemistry

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Video Transcript

Hello everyone. Let us see the following question. So we have two sub questions here. In sub question A we have to find out about the following manganese oxide complexes. The manganese complexes. In the order of increasing crystal field splitting. So in option a we have to arrange the complexes in increasing order off crystal field splitting. This is crystal field splitting. Okay, so the complex has given here and our um men NH three six and the overall charge of the complexes hopeless. Similarly, Yemen cl four. The overall charge of the complex is two minus. Similarly, Yemen CN six. Overall charge of the complex is four minus. And Yemen seeing six. Okay. And overall charge of the complex history minus. So we know that crystal fielding splitting. Crystal field splitting is maximum in october federal complex compared to tetra hydro complex. Okay, so here the octahedron complexes will take plus so least will be mm cl four AM and cl four. The overall two minus here splitting is least. Then among the octahedron complex. We have a weak field. This is ammonia is a weak field Again, Sina is a strong feeling and so we'll bring Yemen Ammonia NH 36 times this one we will take in the next order now among M n C n 64 minus century minus in three minus. Eman has three plus charge here. It has a two plus charge. So maximum is the nuclear charge more is the crystal field splitting. So that means we will bring Yemen CN six 4- and the highest will be Yemen CN six to minus. This is the order with respect to the crystal field splitting. Now in sub question be we have to rank the manganese complexes in the order of increasing intensity of color increasing and then city colors. Okay, so now we have the following components. First of all, we have mangan is um and so forth and minus. Then we have your men ENH three six times and took place and then Yemen cl four minus and the Yemen CN six and three minus C among the intensity of colors. Always remember, tetra federal complexes have more intense colors than octahedron complex. So we have to tetra hydro complexes here, I am meant for and C l M n c L four. So among Mn 04 and mm cl four here the transition of two P electrons of the legal is given to the treaty orbital after central metal here, electrons from three P is given to the three D orbital. So more the electron exact jumps from the differential more the intensity of color. So therefore in the order we have Yemen 04. That means I have to write a menu before in the last place. So a man or for minus which has the highest intensity color. Then we have Yemen cl four, then this is one. So in among M n C N six and M n in S 36. Both are octahedron complexes. However, in M n C N six the color is portion, blue intense color is due to the bridge between the bridge transition between the Yemen and c n C, Especially in the MNCN six. The transition happens to be a little brighter. Okay, Due to the bridged position and the least coloration we can expect in Yemen and next three six two plus. So this is the order according to the intensity of increasing colo rs. Thank you.

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