The non- stoichiometric compound `Fe_(0.94)O` is formed when `x%` of `Fe^(2+)` ions are replaced by as many `2//3 Fe^(3+)` ions The value of x is:

Options

A. 18
B. 12
C. 13
D. 6

Answer

A

Explanation

The no. of `Fe^(3+)` ions replacing `xFe^(2+)` ions `=2x//3`
`:.` Vacancies of cations `=1-2x//3=x//3`
Both `x//3=1-0.94=0.96`
`:. X=0.06xx3=0.18 or 18%`