General electronic configuraiton of lanthanides are
(n - 2) f1-14(n-1)s2p6d0 to 1,ns2
(n - 2) f10-14(n -1)d0-1ns2
(n - 2) f0-14(n -1)d0-1ns2
(n - 2) f0-1(n -1)f14
Lanthanides are
14 elements in the sixth period (at no = 90 to 103) that are fillings 4 f sub-level
14 elements in the seventh period (at no = 90 to 103) that are filling 5f sub level
14 elements in the sixth period (at no = 58 to 71) that are filling 4f sub-level
14 elements in the seventh period (at no = 58 to 71) that are filing 4f sub- level
Which of the following may be considered to be an organometallic compound?
Nickel tetracarbonyl
Chlorophyll
K3[Fe(C2O4)3]
[Co(en)3]CI3
Cr3+ ions are found to be ____________ in colour.
purple
violet
blue
green
The filling of 4f before 5d orbital results in a regular decrease in atomic radii called _________
ionisation energy
electron affinity
lanthanoid contraction
electronegativity
Which of the following elements is responsible for oxidation of water to O2 in biological processes?
Fe
Cu
Mn
Mo
____________ is a blend of metals prepared by mixing the components.
Alloy
Metals
Non metal
Metalloid
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-
In which of the following pairs are both the ions coloured in aqueous solution?
