Oxidation state of Fe in Fe3O4 is
3/2
4/5
5/4
8/3
Which one of the following ions is the most stable in aqueous solution?
(At no Ti = 22, V = 23, Cr = 24, Mn = 25)
Cr3+
V3+
Ti3+
Mn3+
When CuSO4 is electrolysed using platinum electrodes
Copper is liberated at cathode, sulphur at anode
Copper is liberated at cathode, oxygen at anode
Sulphur is liberated at cathode, oxygen at anode
Oxygen is liberated at cathode, copper at anode
Copper sulphate dissolve in excess of KCN to give
CuCN
[Cu(CN)4]3-
[Cu(CN)4]2-
Cu(CN)2
Photographic plates and films have an essential ingredient of
Silver nitrate
Silver bromide
Sodium chloride
Oleic acid
The transition elements have a general electronic configuraiton
ns2np6nd1-10
(n-1)d1-10, ns0-2, np0-6
(n-1)d1-10, ns1-2
nd1-10ns2
In which of the following compounds transition metal has zero oxidation state?
[Fe(CO)5]
NH2.NH2
NOCIO4
CrO5
Which one of the following elements shows maximum number of different oxidation states in its compounds?
Eu
La
Gd
Am
The basic character of the transition metal monoxides follows the order
(At no Ti = 22, V = 23, Cr = 24, Fe = 26)
TiO > FeO > VO > CrO
TiO > VO > CrO > FeO
VO > CrO > TiO > FeO
CrO > VO > FeO > TiO
Identify the incorrect statement among the following.
There is a decrease in the radii of the atoms or ions as one proceeds from La or Lu
Lanthanide contraction is the accumulation of successive shrinkages
As a result of lanthanide contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements
Shielding power of 4 f electrons is quire weak
