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Question

When a co-ordination compound CrCl36H2O is mixed with AgNO3, 2 moles of AgCl are precipitated per mole of the compound. Write
(i) Structural formula of the complex.
(ii) IUPAC name of the complex.

Solution
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There are three compounds with the formula
CrCl3.6H2O. One is violet, one is grey-green, and the third is deep
green.
The violet isomer produces 3 moles of silver chloride upon reaction with silver nitrate and does not lose water in a desiccator.
[Cr(H2O)6]Cl3 (violet)
The grey-green isomer gives 2 moles of silver chloride upon reaction with silver nitrate and loses one mole of water when stored in a desiccator.
[Cr(H2O)5Cl]Cl2.H2O (grey-green)
The deep green isomer gives 1 mole of silver chloride upon reaction with silver nitrate and loses two moles of water when stored in a desiccator.
[Cr(H2O)4Cl2]Cl.2H2O (deep green)
(i)The given compound has a structural formula [Cr(H2O)5Cl]Cl2.H2O
(ii) The IUPAC name of the complex is Pentaaquachlorochromium(III)dichloride monohydrate

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When a co-ordination compound CrCl36H2O is mixed with AgNO3, 2 moles of AgCl are precipitated per mole of the compound. Write
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