which of the following complexes formed by `X^(2+)` ions is most stable?

Options

A. `X^(2+)4NH_(3)hArr[X(NH_(3))_(4)]^(2+),logK_(eq)=11.6`
B. `X^(2+)+4CN^(-)hArr[X(CN)_(4)]^(2-),logK_(eq)=27.3`
C. `X^(2+)+2enhArr[X(en)_(2)]^(2+),logK_(eq)=15.4`
D. `X^(2+)+4H_(2)OhArr[X(H_(2)O)_(4)]^(2+),logK_(eq)=8.9`

Answer

B

Explanation

`K_(eq)uarr` stability `uarr`