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The two isomers X and Y with the formula...

The two isomers X and Y with the formula `Cr(H_2O)_5ClBr_2` were taken for experiment on depression in freezing point. It was found that one mole of X gave depression corresponding to 2 moles of particles and one mole of Y gave depression due to 3 moles of particles. The structural formulae of X and Y respectively are

A

`[Cr(H_2O)_5Cl] Br_2, [Cr(H_2O)_4Br_2]Cl. H_2O`

B

`[Cr(H_2O)_5Cl]Br_2 , [ Cr (H_2O)_3 ClBr__2]. 2H_2O`

C

`[Cr(H_2O)_5Br]BrCl, [Cr(H_2O)_4]Br. H_2O`

D

`[Cr(H_2O)_4Br_2 ]Cl. H_2O, [Cr(H_2O)_5Cl]Br_2`

Text Solution

Verified by Experts

The correct Answer is:
D
1 m ole of complex X giving 2 moles of particle will be `[Cr(H_2O)_4 Br_2]Cl. H_2O`
ie, `[Cr(H_2O)_4Br_2]^(+) Cl^(-)`
1 mole of complex Y giving 3 moles of particles will be `[Cr(H_2O)_5Cl]Br_2`,
ie, `[Cr(H_2O)_5Cl]^(2+) + 2Br^(-)`
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