Properties common to the elements manganese, iron, cobalt, nickel and copper include the ready formation by them all of

$(I)$ coloured ions in aqueous solution

$(II)$ oxides of nitrogen are formed on reaction with concentrated $HNO_3$

$(III)$ chlorides of formula $MCl_2$ and $MCl_3$

  • A

    $I, II, III$

  • B

    $I, II$

  • C

    $II, III$

  • D

    $I$, only

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