Out of the following transition elements, the maximum number of oxidation states are shown by
(a) Sc(Z=21)
(b) Cr (Z=24)
(c) Mn (Z=25)
(d) Fe (Z=26)

Which one of the following exhibits the largest number of oxidation states? (a) Ti (22) (b) Cr(24) (c) V(23) (d) Mn(25)

The maximum oxidation state shown by V(Z=23),Cr(Z=24),Co(Z=27),Sc(Z=21) , are respectively

Among the following gaseous elements with atomic numbers, which will have greater rate of effusion? (A) Z= 7 (B) Z= 8 (C) Z= 9 (D) Z= 10

(a) Why do transition elements show variable oxidation states? (i) Name the element showing maximum number of oxidation states among the first series of transition metals from Sc (Z = 21) to Zn (Z = 30). (ii) Name the element which shows only + 3 oxidation state. (b) What is lanthanoid contraction? Name an important alloy which contains some of the lanthanoid metals.

Among the following transition elements, pick out the element/elements with highest second ionization energy (a) V(At. No. 23) (v) Cr(At. No. 24) (c) Mn(At. No. =25) (d) Cu (At. No. =29) (e) Zn(At. No.=30)

Which among the following ions contain maximum number of unpaired electrons ? (At. No. Cr = 24, Ni=28, Sc=21 , Z=30)

The common oxidation states of element with z = 24 is

The number of unpaired electron in Mn^(4+) (Z = 25) is :-

Write the electronic configurations and predict the number of unpaired electrons in the following : (i) Cr (Z = 24) (ii) Fe(Z = 26)