Both `Co^(3+) and Pt^(4+)` have a coordination number of six. Which of the following pair of complexes will show approximately the same electrical conductance for their `0.001` M aqueous solution ?

Options

A. `CoCl_(3). 4 NH_(3) and PtCl_(4). 4NH_(3)`
B. `CoCl_(3).3NH_(3) and PtCl_(4).5NH_(3)`
C. `CoCl_(3).6 NH_(3) and PtCl_(4).5NH_(3)`
D. `CoCl_(3).6NH_(3) and PtCl_(4).3 NH_(3)`

Answer

C

Explanation

`CoCl_(3).6NH_(3)=[Co(NH_(3))_(6)]Cl_(3)rarr underset("4 ions") ubrace([Co(NH_(3))_(6)]^(3+)+3Cl^(-))`
`PtCl_(4).5NH_(3)=[Pt(NH_(3))_(5)Cl]Cl_(3)rarrunderset("4 ions")ubrace([Pt(NH_(3))_(5)Cl]^(3+)+3Cl^(-))`
Hence, they will show same electrical conductance.