In aqueous solution Cd(II) exists as 6-coordinates aqua-complex. The solution on treatment with Br^(-) ion forms finally 4-coordinate Cd(II) complex with Br^(-) ions successively in four step with stepwise formation constants, logK_(1) = 1.56, log K_(2) = 0.54, log K_(3) = 0.06 and log K_(4) = 0.37. The higher value of K_(4) as compound to K_(3) is due to

In aqueous solution Cd(II) exists as 6-coordinates aqua-complex. The s

1.	In aqueous solution Cd(II) exists as 6-coordinates aqua-complex. The solution on treatment with Br^(-) ion forms finally 4-coordinate Cd(II) complex with Br^(-) ions successively in four step with stepwise formation constants, logK_(1) = 1.56, log K_(2) = 0.54, log K_(3) = 0.06 and log K_(4) = 0.37. The higher value of K_(4) as compound to K_(3) is due to
Answer» transformation of trigonal COMPLEX into tetrahedral complex. change from octahedral to tetrahedral geometry increase in `DeltaH` of the REACTION. Large increase in the number of particles when fourth `Br^(-)` enters the COORDINATION ZONE. Answer :D