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Transition Metals and the d-Block Elements ­ Answers
1. In an atom of a d-block element, electrons go into the 4s subshell before the 3d subshell. When a d-block atom
forms an ion electrons are lost from the 4s subshell first before losing from the 3d subshell. The general
configuration…

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Ammonia, NH3, and organic amines such as ethylamine form complexes. E.g. the complex of Cu2+ and
ammonia, which has the formula [Cu(NH3)4(H2O)2]2+.
Anions such as Cl- and CN- also form complexes, e.g.
[Fe(CN)6]4- is a complex between an Fe2+ ion and six CN- ions.
[CrCl4]- is a complex between a…

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The energy difference between these two sets of d-orbitals in a typical complex ion is equal to the energy
of a photon in the visible region of the spectrum.
When white light shines through a solution of a complex ion of a transition metal, photons of a particular
frequency are…

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35. Chromium is unstable in the +2 state compared with the +3 state. The +2 state can be stabilised by formation of a
complex with ethanoate ions, CH3COO-. The hydrated chromium (II) ions undergo ligand exchange and a
precipitate of red chromium (II) ethanoate complex is formed:
2[Cr(H2O)6]2+ (aq) +…

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E.g. Cu2+ + e- Cu+ E = +0.15 V
45. The feasibility of a redox reaction is indicated by the value of the standard potential of the cell, E cell. Feasibility
is worked out by:
1) Reverse the half equation that has one of the reactants on the RHS and…

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