Which of the following will be coloured ion :

  • A

    $Fe^{2+}$

  • B

    $Cu^+$

  • C

    $Sc^{3+}$

  • D

    $Mn^{2+}$

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$(a)$ Answer the following questions :

$(i)$ Which element of the first transition series has highest second ionisation enthalpy ?

$(ii)$ Which element of the first transition series has highest third ionisation enthalpy ?

$(iii)$ Which element of the first transition series has lowest enthalpy of atomisation ?

$(b)$ Identify the metal and justify your answer.

$(i)$ Carbonyl $M(CO)_5$  $(ii)$  $MO_3F$