Which of the following elements is responsible for oxidation of water to O2 in biological processes?
Fe
Cu
Mn
Mo
Which one of the following ionic species will impart colour to an aqueous solution?
Ti4+
Cu+
Zn2+
Cr3+
Which of the following may be considered to be an organometallic compound?
Nickel tetracarbonyl
Chlorophyll
K3[Fe(C2O4)3]
[Co(en)3]CI3
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
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
Which one of the following elements shows maximum number of different oxidation states in its compounds?
Eu
La
Gd
Am
NH3
N2
O3
H2S
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
