Which of the following is non-stoichiometric?

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(C) Non-stoichiometric compounds are those in which the ratio of elements does not correspond to simple whole numbers. $FeO$ is a classic example of a

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$FeO$

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(C) Non-stoichiometric compounds are those in which the ratio of elements does not correspond to simple whole numbers. $FeO$ is a classic example of a metal-deficient non-stoichiometric oxide,often represented as $Fe_{1-x}O$ where $x$ is a small fraction. While $Fe_3O_4$ and $Fe_2O_3$ are generally considered stoichiometric,$FeO$ is the most prominent non-stoichiometric compound among the options provided.

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