Which one of the following elements shows maximum number of different oxidation states in its compounds?
Eu
La
Gd
Am
The transition elements have a general electronic configuration
ns2np6nd1-10
(n-1)d1-10, ns0-2, np0-6
(n-1)d1-10, ns1-2
nd1-10ns2
Actinides
are all synthetic elements participate.
Include element 104
have any short lived isotopes
have variable valency
The oxidation state of Cr in K2Cr2O7 is
+5
+3
+6
+7
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
Oxidation state of Fe in Fe3O4 is
3/2
4/5
5/4
8/3
Photographic plates and films have an essential ingredient of
Silver nitrate
Silver bromide
Sodium chloride
Oleic acid
Which of the following may be considered to be an organometallic compound?
Nickel tetracarbonyl
Chlorophyll
K3[Fe(C2O4)3]
[Co(en)3]CI3
Among the lanthanides the one obtained by synthetic method is
Lu
Pm
Pr
Which one of the following is an ore of silver?
Argentite
Stibnite
Haematite
Bauxite
