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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ss199

Which of the following statements are correct?

AIn $Fe X_{0.95} O$ , some $Fe X^{2 +}$ ions are replaced by $Fe X^{3 +}$ to maintain electrical neutrality.
BWhen $KCl$ is heated in potassium vapour the crystal develops a metal deficiency.
C $Zn X_{1 + x} O$ (formed on heating $ZnO$ ) is an n-type semiconductor.
D $Fe X_{0.95} O$ contains cation vacancies.

Answer: A, C, D

Charge neutrality in

Fe X_{0.95} O

needs some

Fe X^{3 +}

and leaves cation sites vacant (true, true). In

Zn X_{1 + x} O

the excess

Zn

gives free electrons, so it is n-type (true). Heating

KCl

in K vapour adds metal, giving metal excess through anion vacancies, not deficiency (false).

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