The oxidation state of Cr in K2Cr2O7 is
+5
+3
+6
+7
Cuprous compounds such as CuCI, CuCN and CuSCN are the only salts stable in H2O due to
high hydration energy of Cu+ ions
their inherent tendency not to disproportionate
diamagnetic nature
insolubility in water
In which of the following compounds transition metal has zero oxidation state?
[Fe(CO)5]
NH2.NH2
NOCIO4
CrO5
The common oxidation states of Ti are
+2,+3
+3,+4
3,-4
+2, +3, +4
Stainless steel contains iron and
Cr + Ni
Cr + Zn
Zn + pb
Fe + Cr + Ni
Which of the following elements is responsible for oxidation of water to O2 in biological processes?
Fe
Cu
Mn
Mo
Oxidation state of Fe in Fe3O4 is
3/2
4/5
5/4
8/3
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
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
