Which of the following statements is/are correct for `[Cr(NH_3)_5 Br] SO_4` and `[Cr(NH_3)_5 SO_4]Br`
(I) Co-ordination number of the central atom is 6 for both
(II) In both the cases, the anionic ligand satisfies the primary valency in equal manner.
(III) Electrical conductivities of both the complexes are equal

Options

A. I, II
B. I, III
C. II, III
D. I only

Answer

D

Explanation

Statement Iis correct, Here `SO_4^(2-)` acts as monodentate ligand.
Statement II is incorrect. `Br^(-)` satisfies only one primary valency while `SO_4^(2-)` satisfies two primary valency of `Cr^(3+)`.
Statement III is incorrect. Since the charges of both anions are different (though number of ions produced are same), the electrical conductivities are different.