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 hybridisation of Cr in the complexes A and B respectively 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 hybridisation of Cr in the complexes A and B respectively is
Answer» `d^(2) SP^(3) and sp^(3) d^(2)` `sp^(3) d^(2) and d^(2) sp^(3)` `sp^(3)d and d sp^(3)` `d^(2)sp^(3) and d^(2)sp^(3)` Solution :Both the above FORMS have Cr in +3 oxidation state. Hence, its ELECTRONIC CONFIGURATION is `[Ar] 3d^(3)`, i.e., Thus, the hybridisation of Cr in each case is `d^(2)sp^(3)`, i.e., both the complexes are octahedral.