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Question

What kind of isomerism exists between [Cr(H2O)6]Cl3 (violet) and [Cr(H2O)5Cl]Cl2.H2O (greyishgreen)?
(a) Linkage isomerism 
(b) Solvate isomerism 
(c) Ionisation isomerism 
(d) Coordination isomerism 
 


Solution

Answer: (b). Solvate isomerism

Solute isomerism to shown when two compounds having the same molecular formula differ by whether it has solvent molecule is directly bonded to a metal ion or is present as free solvent molecules in the crystal lattice.
When water is present as a solvent and shows this type of isomerism then it is known as hydrate isomerism or Solvate isomerism.
Coordination compound [Cr(H2O)6]Cl3 and [Cr(H2O)5Cl]H2O.Cl2 are solvate isomers, because water is exchanged by chloride ion. This is why both of them show different colour on exposure to sunlight.

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