1.

A metal complex having the composition Cr (NH_(3))_(4)Cl_(2) Br has been isolated in two forms A and B. The form A reacts with AgNO_(3) to give a white precipitate readily soluble in dilute aqueous ammonia whereas B gives a pale yellow precipitate soluble in concentrated ammonia. The formula of the complex A is

Answer»

`[Cr(NH_(3))_(4)Br]Cl_(2)`
`[Cr(NH_(3))_(4)BrCl]Cl`
`[Cr(NH_(3))_(4)Cl_(2)]Br`
Both (a) and (B) are possible

Solution :As form A is readily soluble in dilute AQUEOUS ammonia, it must have `Cl^(-)` outside the coordination sphere, i.e., its formula is `[Cr(NH_(3))_(4)BrCl]^(+)Cl^(-)`.


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