Most transition metals

$I :$ form sets of compounds which display different oxidation states of the metal

$II :$ form coloured ions in solution

$III :$ burn vigorously in oxygen

$IV :$ act as catalyst

  • A

    $I, II, III$ are correct

  • B

    $II, III, IV$ are correct

  • C

    $I, II, IV$ are correct

  • D

    all are correct

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