When (NH4)2Cr2O7 is heated, the gas evolved is
N2
NO2
O2
N2O
Identify the incorrect statement among the following.
There is a decrease in the radii of the atoms or ions as one proceeds from La or Lu
Lanthanide contraction is the accumulation of successive shrinkages
As a result of lanthanide contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements
Shielding power of 4 f electrons is quire weak
The common oxidation states of Ti are
+2,+3
+3,+4
3,-4
+2, +3, +4
Of the following transition metals, the maximum number of oxidation states are exhibited by
chromium (Z = 24)
manganese (Z = 25)
iron (Z = 26)
titanium (Z = 22)
The aqueous solution containing which one of the following ions will be colourless?
(At no: sc = 21, Fe = 26, Ti = 22, Mn = 25)
Sc3+
Fe2+
Ti3+
Mn2+
The basic character of the transition metal monoxides follows the order
(At no Ti = 22, V = 23, Cr = 24, Fe = 26)
TiO > FeO > VO > CrO
TiO > VO > CrO > FeO
VO > CrO > TiO > FeO
CrO > VO > FeO > TiO
Which of the following may be considered to be an organometallic compound?
Nickel tetracarbonyl
Chlorophyll
K3[Fe(C2O4)3]
[Co(en)3]CI3
Which one of the following ions is the most stable in aqueous solution?
(At no Ti = 22, V = 23, Cr = 24, Mn = 25)
Cr3+
V3+
Mn3+
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
Stainless steel contains iron and
Cr + Ni
Cr + Zn
Zn + pb
Fe + Cr + Ni
