MCQ
Which of the following is not an interstitial compound?
- A$\text{TiC}$
- B$\text{MoC}$
- C$\mathrm{Fe}_{0.82} \mathrm{O}$
- ✓$\mathrm{Cr}_2 \mathrm{O}_3$
✓
Answer
Correct option: D.
$\mathrm{Cr}_2 \mathrm{O}_3$
$\text{TiC, MoC}$ and $\mathrm{Fe}_{0.82} \mathrm{O}$ are interstitial compounds. However, $\mathrm{Cr}_2 \mathrm{O}_3$ is not an interstitial compound. Interstitial compounds are those compounds which are formed when small atoms like $H, C$ or $N$ are trapped inside the interstitial spaces in the crystal lattice of metals. They are usually non$-$stoichiometric in nature and cannot be represented by a definite composition and are neither typically ionic nor covalent.
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