Which of the following has more unpaired d-electrons ?
Zn+
Fe2+
N3+
Cu-
Which of the following statements is not correct ?
La(OH)3 is less basic than Ln(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
Which one of the following forms a colourless solution in aqueous medium ?
V3+
Cr3+
Ti3+
Sc3+
The oxidation state of Cr in K2Cr2O7 is
+5
+3
+6
+7
Nitriding is the process of surface hardening of steel by treating it in an atmosphere of
NH3
N2
O3
H2S
Which one of the following characteristics of the transition metals is associated with their catalytic activity ?
Colour of hydrated ions
Variable oxidation states
High enthalpy of atomisation
Paramagnetic behaviour
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+
Which of the following may be considered to be an organometallic compound ?
Nickel tetracarbonyl
Chlorophyll
K3[Fe(C2O4)3]
[Co(en)3]Cl3
The common oxidation states of Ti are
+2, +3
+3, +4
3, -4
+2, +3, +4
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
