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 B is

A metal complex having the composition Cr (NH_(3))_(4)Cl_(2) Br has be

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 B is
Answer» `[Cr(NH_(3))_(4)BR]Cl_(2)` `[Cr(NH_(3))_(4)ClBr]Cl` `[Cr(NH_(3))_(4)Cl_(2)]Br` `[Cr(NH_(3))_(4)]BrCl_(2)` Solution :As form B gives a pale YELLOW PRECIPITATE SOLUBLE in concentrated ammonia, it MUST have `Br^(-)` outside the coordination sphere, i.e., its formula is `[Cr(NH_(3))_(4)Cl_(2)]^(+)Br`.