More number of oxidation states are exhibited by the actinides than by the lanthanides. The main reason for this is
more energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals.
lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals.
greater metallic character of the lanthanides than that of the corresponding actinides
more active nature of the actinides
When (NH4)2Cr2O7 is heated, the gas evolved is
N2
NO2
O2
N2O
The aqueous solution containing which one of the following ions will be colourless ?
Sc3+
Fe2+
Ti3+
Mn2+
Copper sulphate dissolves in excess of KCN to give
CuCN
[Cu(CN)4]3-
[Cu(CN)4]2-
Cu(CN)2
Which of the following elements is responsible for oxidation of water to O2 in biological processes ?
Fe
Cu
Mn
Mo
The basic character of the transition metal monoxides follows the order
TiO > FeO > VO > CrO
TiO > VO > CrO > FeO
VO >CrO >TiO >FeO
CrO >VO >FeO>TiO
Cinnabar is an ore of
Hg
Pb
Zn
In which of the following pairs are both the ions coloured in aqueous solution ?
Ni2+, Ti3+
Sc3+, Ti3+
Sc3+, Co2+
Ni2+, Cu+
In which of the following compounds transition metal has zero oxidation state ?
[Fe(CO)5]
NH2 . NH2
NOClO4
CrO5
The lanthanide contraction is responsible for the fact that
Zr and Yt have about the same radius
Zr and Nb have similar oxidation state
Zr and Hf have about the same radius
Zr and Zn have the same oxidation state
