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The crystal with metal deficiency defect...

The crystal with metal deficiency defect is:

A

NaCl

B

FeO

C

KCl

D

ZnO

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To solve the question regarding which crystal exhibits a metal deficiency defect, we will analyze each of the given options based on the concept of metal deficiency defects in solid-state chemistry. ### Step-by-Step Solution: 1. **Understand Metal Deficiency Defect**: - A metal deficiency defect occurs when there is a deficiency of metal cations compared to anions in a crystal lattice. This often happens when a higher oxidation state cation is introduced into a crystal that normally contains a lower oxidation state cation. 2. **Analyze the Options**: - **Option A: NaCl** - Sodium (Na) has only one oxidation state (+1). Therefore, it cannot exhibit a metal deficiency defect as there are no higher oxidation states to introduce. - **Option B: FeO** - Iron (Fe) in FeO can exist in two oxidation states: +2 (Fe²⁺) and +3 (Fe³⁺). If Fe³⁺ is introduced into the FeO structure, it can lead to a deficiency of Fe²⁺, thus creating a metal deficiency defect. - **Option C: KCl** - Potassium (K) also has only one oxidation state (+1). Similar to NaCl, KCl cannot exhibit a metal deficiency defect. - **Option D: ZnO** - Zinc (Zn) has a fixed oxidation state of +2. There are no higher oxidation states available to create a metal deficiency defect. 3. **Conclusion**: - Based on the analysis, the only compound that can exhibit a metal deficiency defect is **FeO**. This is because it allows for the introduction of a higher oxidation state (Fe³⁺) that can lead to a deficiency of the lower oxidation state (Fe²⁺). ### Final Answer: The crystal with metal deficiency defect is **FeO** (Option B). ---
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