K2Cr2O7 on heating with aqueous NaOH gives
CrO42-
Cr(OH)3
Cr2O72-
Cr(OH)2
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
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
Which of the following may be considered to be an organometallic compound?
Nickel tetracarbonyl
Chlorophyll
K3[Fe(C2O4)3]
[Co(en)3]CI3
Which of the following metals corrodes readily in moist air?
Gold
Silver
Nickel
Iron
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
Photographic plates and films have an essential ingredient of
Silver nitrate
Silver bromide
Sodium chloride
Oleic acid
Among the lanthanides the one obtained by synthetic method is
Lu
Pm
Pr
Gd