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NEET levelSingle correct optionDifficulty 1 of 3df009

Which statement about interstitial compounds of transition metals is correct?

  1. AThey have fixed stoichiometric formulae governed by the normal valence of the metal
  2. BThey lose the metallic conductivity of the parent metal
  3. CThey are generally very hard and have melting points higher than those of the parent metals
  4. DThey are chemically much more reactive than the parent metal

Answer: C

Small atoms (H, B, C, N) occupy voids in the metal lattice, making it harder and raising the melting point. The compounds are non-stoichiometric, retain metallic conductivity and are chemically inert, so only the first statement is correct.
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