Which of the following may be considered to be an organometallic compound ?
Nickel tetracarbonyl
Chlorophyll
K3[Fe(C2O4)3]
[Co(en)3]Cl3
Nitriding is the process of surface hardening of steel by treating it in an atmosphere of
NH3
N2
O3
H2S
Which of the following has more unpaired d-electrons ?
Zn+
Fe2+
N3+
Cu-
Cinnabar is an ore of
Hg
Cu
Pb
Zn
Which of the following statements is not correct ?
La(OH)3 is less basic than Li(OH)3
In lanthanide series ionic radius of Ln3- ion decreases.
La is actually an element of transition series rather lanthanide
Atomic radius of Zr and Hf are same because of lanthanide contraction
Among the following series of transition metal ions, the one in which all metal ions have 3d2 electronic configuration
is (At no : Ti = 22; V = 23; Cr = 24; Mn = 25)
Ti3+, V2+, Cr3+, Mn4+
Ti+, V4+, Cr6+, Mn7+
Ti4+, V3+, Cr6+, Mn3+
Ti2+, V3+, Cr4+,Mn5+
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
The aqueous solution containing which one of the following ions will be colourless ?
Sc3+
Ti3+
Mn2+
Which one of the following elements shows maximum number of different oxidation states in its compounds ?
Eu
La
Gd
Am
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
