The transition metals exhibit higher enthalpies of atomisation due to

  • A

    their ability to show variable oxidation states

  • B

    the presence of incompletely filled $d-$ subshell

  • C

    their ability to exist in the solid state with unpaired electrons

  • D

    strong interatomic interaction aries because of having large number of unpaired electrons in their atoms

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  • [AIEEE 2003]

The catalyst used in the contact process is