Question

Metal deficiency defect is shown by Fe_0.93O. In the crystal, some Fe²⁺ cations are missing and loss of positive charge is compensated by the presence of Fe³⁺ ions. The percentage of Fe²⁺ ions in the Fe_0.93O crystals is _____ . (Nearest integer)

Answer 1

Correct answer is 85%

In Fe_0.93O for every 93 Fe ions 14 are Fe⁺³ and 

(93 – 14) = 79 are Fe⁺² ions

∴% Fe⁺² = 79/93 x 100 = 84.9%

∴nearest integer = 85%