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Coordination Compounds

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Q.

are distinguished through formation of complex   and  , when   gas is passed

Q.

In which case racemic mixture is obtained on mixing its mirror images in 1:1 molar ratio

Q.

will form geometrical isomers

Q.

The intense blue colour of Prussian blue salts arises from which one of the following?

Q. what is the denticity of SO4-2 and SO3-2?

The sulfate ion can act as a ligand attaching either by one oxygen (monodentate) or by two oxygens as either a chelate or a bridge. An example is the complex [Co(en)2(SO4)]+Br− or the neutral metal complex PtSO4(P(C6H5)3)2 where the sulfate ion is acting as a bidentate ligand.
they can have more than one denticity value depending upon the cordination compound

Q. when there are more than two ligands in the coordination sphere what should we use the prefix ?
whether we should use "tri, tetra, penta," or we should use "tris, tetrakis, pentakis" ??

Greek prefixes are used to designate the number of each type of ligand in the complex ion, e.g. di-, tri- and tetra-. If the ligand already contains a Greek prefix (e.g. ethylenediamine) or if it is polydentate ligands (ie. can attach at more than one binding site) the prefixes bis-, tris-, tetrakis-, pentakis-, are used instead.
You have to use tri, tetra