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Interstitial compounds (e.g., TiC, Fe₃H, VH₀.₅₆) of transition metals have:
AStrict stoichiometry (always whole-number ratios)
BIonic bonding only
COften non-stoichiometric composition, very high melting points, very hard, retain metallic conductivity, are chemically inert
DLow melting points and high reactivity
Answer & Solution
Correct answer: C. Often non-stoichiometric composition, very high melting points, very hard, retain metallic conductivity, are chemically inert
**Interstitial compounds** form when small atoms (H, C, N) occupy interstitial sites in the metal lattice. Properties: **non-stoichiometric, very hard (some borides approach diamond), high m.p. (higher than pure metal), metallic conductivity preserved, chemically inert**.
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