Which one of the following is an ore of silver?
Argentite
Stibnite
Haematite
Bauxite
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
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
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
Gd
The common oxidation states of Ti are
+2,+3
+3,+4
+1,+2
+2, +3, +4
When (NH4)2Cr2O7 is heated, the gas evolved is
N2
NO2
O2
N2O
The most durable metal plating on iron to protect against corrosion is
Nickel plating
Tin plating
Copper plating
Zinc plating
