Which of the following statements is correct regarding $d-$block elements?

  • A
    They are all metals.
  • B
    They show variable valency.
  • C
    They form coloured ions and complex salts.
  • D
    All of the above statements are correct.

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Which one of the following ions will be colourless in an aqueous solution? (Atomic numbers: $Sc = 21, Fe = 26, Ti = 22, Mn = 25$)

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