Metal Deficiency Defect is observed due to:

Presence of electrons

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Presence of impurities

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Composition of metals

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Deficiency of anions

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Solution

The correct option is C
Composition of metals

There are many solids which are difficult to prepare in the stoichiometric composition and contain less amount of the metal as compared to the stoichiometric proportion. A typical example of this type is FeO which is mostly found with a composition of Fe_0.95O.

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In metal deficiency defect

FeO is found with a composition of $F e_{0.95}$ O. It ranges from $F e_{0.93}$ O to Fe_0.95O. Which type of defect is it showing here?

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