1.

Arrange the following in order of increasing molar conductivity. (i) Mg[Cr(NH_(3))(Cl)_(5)] (ii)[Cr(NH_(3))_(5)Cl]_(3)[CoF_(6)]_(2) (iii) [Cr(NH_(3))_(3)Cl_(3)]

Answer»

SOLUTION :These complexes can ionise in solution as :
`MG[Cr(NH_(3))(Cl)_(5)]=Mg^(2+)+[Cr(NH_(3))(Cl)_(5)]^(2-)`
`[Cr(NH_(3))_(5)Cl]_(3)[CoF_(6)]_(2)=[Cr(NH_(3))_(5)Cl]^(2+)+[CoF_(6)]^(3-)`
`[Cr(NH_(3))_(3)Cl_(3)]=` does not ionize
As the number of IONS in solution increases, their molar conductivity also increases. Therefore, conductivity follows the order :
`[Cr(NH_(3))_(3)Cl_(3)] lt [Cr(NH_(3))_(5)Cl]_(3)[CoF_(6)]_(2) lt Mg[Cr(NH_(3))(Cl)_(5)]`


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