Of the following transition metals, the maximum number of oxidation states are exhibited by
chromium (Z = 24)
manganese (Z = 25)
iron (Z = 26)
titanium (Z = 22)
Bell-metal is an alloy of
Cu + Pb
Cu + Sn
Cu + Zn
Cu + Ni
Which one of the following elements shows maximum number of different oxidation states in its compounds ?
Eu
La
Gd
Am
General electronic configuration of lanthanides are
(n-2) f1-14(n-1)s2 p6d0-1ns2
(n-2) f10-14(n-1)d0-1ns2
(n-2) f0-14 (n-1)d10ns2
(n-2)d0-1 (n-1) f1-14 ns2
Which one of the following ions is the most stable in aqueous solution ?
Cr3+
V3+
Ti3+
Mn3+
Which of the following has more unpaired d-electrons ?
Zn+
Fe2+
N3+
Cu-
Which one of the following ionic species will impart colour to an aqueous solution ?
Ti4+
Cu+
Zn2-
The main reason for larger number of oxidation states exhibited by the actinides than the corresponding lanthanides, is
lesser energy difference between 5f and 6d orbitals than between 4f and 5d orbitals
larger atomic size of actinides than the lanthanides
more energy difference between 5f and 6d orbitals than between 4f and 5d orbitals
greater reactive nature of the actinide than the lanthanides
The transition elements have a general electronic configuration
ns2np6nd1-10
(n-1)d1-10, ns0-2, np0-6
(n-1)d1-10, ns1-2
nd1-10ns2
