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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ss109

For the non-stoichiometric oxide $Fe X_{0.95} O$ , which statements are correct?

ASome $Fe X^{2 +}$ are replaced by $Fe X^{3 +}$ to keep the crystal neutral.
BThe average oxidation state of Fe is about +2.11.
CThe ratio of O to Fe atoms is less than 1.
DIt is a metal-deficiency defect.

Answer: A, B, D

Fe is deficient, so some

Fe X^{2 +}

sites are empty and the charge is balanced by

Fe X^{3 +}

. O:Fe

= 1/0.95 = 1.05 > 1

, so the third statement is false. Average oxidation state

= 2/0.95 = 2.11

.

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