The IUPAC definition of a transition element is that it is an element that has an incomplete d-subshell in either the neutral atom or its ion. Thus the group 12 elements are member of the d-block but are not transition elements.
Chemically solft members of the d-block occurs as sulphide minerals and are partially oxidised to obtain the metal, the more electropositive 'hard' metals occurs as oxides and are extracted by reduction.
Opposite to p-block elements, the higher oxidation states are favoured by the heavier elements of d-block Metals on the right of the d-block tend to exist in low oxidation states and form complexes with the ligands. Square-planar complexes are common for the platinum metals and gold in oxidation states that yield `d^8` electronic configuration, which include RH(I),Ir(I),Pd(II),Pt(II) and Au(III).
The most distinctive features/properties of transition metal complex is their wide range of colours.The crystal field theory attributes the colour of the coordination compounds to d-d transition of the electron.It is important to note that (a) in absence of ligand, crystal field spilling does not occur and hence the substances is colourless, (b) the type of ligand also influences the colour of the complexes.
Which of the following statements is incorrect ?

Options

A. In d-block elements , the d-orbitals of the penultimate energy level of their atoms receive electrons and thus give rise to three complete and one incomplete rows of the transition metals.
B. Copper glance or chalcocyte and argentite both are sulphide ores
C. Iron is extracted from its oxide ore, siderite by reduction with carbon monoxide and coke in blast furnace
D. High melting and boiling point of transition elements are attributed to the involment of (n-1) d electrons in addition to the ns electrons.

Answer

C

Explanation

(A)There are three complete rows , 3d, 4d and 5d series and one incomplete 6d series.
(B)`Cu_2S` is chalcocyte or copper glance and `Ag_2S` is argentite.
(C )Siderite is `FeCO_3` i.e. carbonate ore.
`3Fe_2O_3+COto2Fe_3O_4+CO_2` 500 - 800 K
`Fe_3O_4+COto3FeO+CO_2` 500 - 800 K
`FeO+COtoFe+CO_2` 900 - 1500 K
`FeO+CtoFe+CO` above 1500 K
(D)As the involvement of greater number of (n-1)d electrons in addition to ns electrons results into strong interatomic metallic bonding.