Oxidation state of Fe in Fe3O4 is
3/2
4/5
5/4
8/3
Zn2+ ions are found to be___________
colourless
violet
blue pink
green
The imperfect shielding of one electron by another in the same set of orbitals is one of the factor responsible for __________
Lanthanoid contraction
electron affinity
electronegativity
ionisation energy
________ compounds are those which are formed when small atoms like H,C, or N are trapped inside the crystal lattices of metals.
metallic
ionic
co-ordinate
interstitial
Which of the following elements is responsible for oxidation of water to O2 in biological processes?
Fe
Cu
Mn
Mo
Among the following series of transition metal ions, the one in which all metal ions have 3d2 electronic configuration is : (At no : Ti = 22; V = 23; Cr = 24; Mn = 25)
Ti3+, V2+, Cr3+, Mn4+
Ti+, V4+, Cr6+, Mn7+
Ti4+, V3+, Cr2+, Mn3+
Ti2+, V3+, Ci4+, Mn5+
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)
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
CuSO4 when reacts with KGN forms CUCN, which is insoluble in water. It is soluble in water. It is soluble in excess of the following complex
K2[Cu(CN)4]
K3[Cu(CN)4]
Cu(CN)2
Cu[KCu(CN)4]
Copper sulphate dissolve in excess of KCN to give
CuCN
[Cu(CN)4]3-
[Cu(CN)4]2-
