Many transition metals form interstitial compounds. The characteristics of these interstitial compounds are

$(I)$ They have high melting points, higher than those of pure metals

$(II)$ They are very hard

$(III)$ They retain metallic conductivity

$(IV)$ They are chemically more reactive than the pure metals

  • A

    $I,\,II,\,III$

  • B

    $I, \,III$

  • C

    $II,\, IV$

  • D

    $IV$ only

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