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JEE Main levelOne or more correct optionsDifficulty 2 of 3df031

Select ALL correct statements about interstitial compounds.

  1. AThey lose electrical conductivity completely
  2. BThey are usually non-stoichiometric
  3. CThey are harder than the parent metal
  4. DThey are formed when small atoms such as H, C or N occupy voids in the metal lattice

Answer: B, C, D

Small atoms fit in the interstices, the composition is variable (e.g. ) and the added bonding makes them hard. They retain metallic conductivity, so the last statement is false.
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