Explanation
Ground state electronic config. of Cr atom = [Ar] 3d5 4s1.
[Ne] 3s23p5 is the electronic config. of a p-block element whereas other configs. are those of d-block elements.
Aqueous solution of Co(NO3)2 in which Co2+(d7) contains incompletely filled d-orbitals is coloured.
Aqueous solution of Co(NO3)2 in which Co2+(d7) contains incompletely filled d–orbitals is coloured.
Cl- in KCl is a very weak reducing agent and thus cannot reduce Cu2+ to Cu+ and hence no CuCl is formed.
Mohar salt is FeSO4.(NH4)2SO4.6H2O,
Nessler’s reagent is K2HGI4 + KOH i.e an alkaline solution of K2HgI4
(4) Zinc plating
3Cu + 8HNO3(dil) → 3Cu(NO3)2 + 2NO + 4H2O
Cu2+ = 3d9, after splitting of d- orbitals in an octahedral field, the two degenerate dx2 – y2 and dz2 orbitals contain unequal distribution of electrons 2 and 1 in them which causes distortion in the metal ligand bond length due to unequal repulsion.(Jahn – Teller distortion ).
Fe3+ = 3d5 (5 unpaired electrons) shows highest magnetic moment.
Noble metals are soluble in aqua regia (3HCl + 1 HNO3).
FeCl3 is not a reducing agent. It will not react with oxidising agent KMnO4 and no colour is discharged.
Ferrous ferrocyanide Fe2[Fe(CN)6] is turnbull’s blue and ferric ferrocynide Fe4[Fe(CN)6]3 is Prussian blue.
Cu + 2AgNO3 →Cu(NO3)2 + 2Ag ; Cu is oxidized.
The electronic configuration 3d5 4so has the maximum magnetic moment.
Hg is liquid at 0oC which is due to its very high 1 E and weak metallic bond as it has zero unpaired electrons.
Starting material for the manufacture of KMnO4 is pyrolusite ( MnO2).
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