Multiple Choice QuestionsWhich of the following complex compounds gives 5 isomers? (M = metal ; a,b,c,d,e, f = ligands)
Ma4b2
Ma2b2c2
Mabcdef
Ma3b3
Identify the pair of complex showing geometrical isomerism and diamagnetic.
1.[PdCl2(PPh3)2]:[Pt(NH3)2ClBr]
2.[PdCl2(PPh3)2]:[NiCl2(PPh3)2]
3.[Pt(PEt3)Cl2]2:[Co(en)3]Br3
1
1, 2 and 3
2 and 3
3 and 4
An example for a double salt is
potassium ferricyanide
cobalt hexamine chloride
cuprous sulphate
Mohr's salt
Which one of the following platinum complexes is used as anticancer drug?
[Pt(NH3)4]2+
[PtCl6]2-
cis-[PtCl2(NH3)2]
trans-[PtCl2(NH3)2]
The effective atomic number (EAN) of platinum in potassium hexachloro-platinate(IV) is
78
74
84
86
Pick out the complex compound in which the central metal atom obeys EAN rule strictly
K4[Fe(CN)6]
K3[Fe(CN)6]
[Cr(H2O)6]Cl3
[Cu(NH3)4]SO4
The ratio of cationic radius to anionic radius in an ionic crystal is greater than 0.732. Its coordination number is
6
8
1
4
Which one of the following statements is incorrect?
In K3[Fe(CN)6] the ligand has satisfied only the secondary valency of ferric ion
In K3[Fe(CN)6],the ligand has satisfied both primary and secondary valancies of ferric ion
In K3[Fe(CN)6], the ligand has satisfied both primary and secondary valancies of ferrous ion
In [Cu(NH3)4]SO4 the ligand has satisfied only the secondary valency of copper
A.
In K3[Fe(CN)6] the ligand has satisfied only the secondary valency of ferric ion
Primary valency of metal is satisfied only by the anion. It is simply ionic valency. While secondary valency is satisfied by ligands (which can give a lone-pair of e-). The ligands satisfying secondary valency, are always written in co-ordination sphere. This concept was given by Werner.
In K3[Fe(CN)6] the CN- ions satisfy both the primary as well as secondary valency of Fe3+ ion.
The number of unidentate ligands in the complex ion is called
oxidation number
primary valency
coordination number
EAN
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