IISER Chemistry - Transition metals including lanthanides and actinides
Exam Duration: 45 Mins Total Questions : 30
The common oxidation state of the elements of transition series is
- (a)
+1
- (b)
+2
- (c)
+3
- (d)
+4
which one of the following is lanthanides element?
- (a)
Cr
- (b)
Mn
- (c)
Co
- (d)
Ce
Which one of the following is first man-made element?
- (a)
Sc
- (b)
Ti
- (c)
Tc
- (d)
Mo
The properties of transition elements Zr and Hf are similar because
- (a)
they possess same number of electrons
- (b)
both have similar radii
- (c)
both belong to d-block elements
- (d)
None of these
which one of the following elements does not belong to the first transition series?
- (a)
Fe
- (b)
Cr
- (c)
Ni
- (d)
Ag
The outer electronic configuration of Cu2+ is
- (a)
3d104s
- (b)
3d104s1
- (c)
3d104s2
- (d)
3d104s2
The outer electronic configuration of 58Ce is
- (a)
4f15d16s
- (b)
4f05d26s2
- (c)
4f0.5d36s2
- (d)
None of these
The value of Bohr magneton \((\mu )\) for Cr2+ is
- (a)
2.76
- (b)
3.86
- (c)
4.80
- (d)
5.96
which one of the following transition metal iones has the least magnetic moment?
- (a)
Cr2+
- (b)
Ti2+
- (c)
V2+
- (d)
Mn2+
which one of the following statements is true for K2Cr2O7?
- (a)
It is less soluble than Na2Cr2O7
- (b)
It is more stable than Na2Cr2O7
- (c)
It is orange in colour
- (d)
ALL OF THE ABOVE
Pyrolusite is
- (a)
MnO2
- (b)
Mn3O4
- (c)
MnO
- (d)
KMnO4
The gentral electranic configuration of transition elements is
- (a)
(n-1)d1-5
- (b)
(n-1)d-10 ns1
- (c)
(n-1)d1-10 ns1-2
- (d)
NONE OF THESE
If a non-metallic elements is dispersed in the intersital spaces of the crystal lattice of the metal, then which of the following properties is likely to be obtained from the metal?
- (a)
The metal may become softer
- (b)
The metal will become more ductile
- (c)
The metal will become less malleable
- (d)
Metal will have lower tensle strength
Manganese exhibitts the most stable state in
- (a)
2
- (b)
5
- (c)
6
- (d)
7
Besides carbon the essential constituent of stainless steel is
- (a)
V
- (b)
Cr
- (c)
Mn
- (d)
Co
which one of the following alloys is used in tracer bullets?
- (a)
misch metal alloy
- (b)
pyrophoric alloys
- (c)
duralumin
- (d)
NONE OF THE ABOVE
which of the following statements concerning Lanthanide elements is false?
- (a)
Lanthanides are separated from one another by ion exchange methods
- (b)
Most characteristic oxidation state of lanthanide elements is +3
- (c)
All lanthanides are highly dense metals
- (d)
The ionic radii of trivalent lanthanides steadily increase in the atomic number
which of the following does not exhibit the variable oxidation state?
- (a)
Zn
- (b)
Mn
- (c)
Fe
- (d)
Cu
For the process\(Cu\quad (g)\rightarrow { Cu }^{ + }\quad (g)+e\), the electron is removed from
- (a)
3d-subshell
- (b)
4s-subshell
- (c)
3p-subshell
- (d)
any one of the above
The reaction \({ Cr }_{ 2 }{ O }_{ 7 }^{ 2- }\leftrightharpoons { 2CrO }_{ 4 }^{ 2- }\) is shifted to the right in
- (a)
an acidic medium
- (b)
a basic medium
- (c)
netural medium
- (d)
any medium
Amongst TiF2-, CoF3-, Cu2CI2 and NiCI42- (At. Nos. Ti=22, Co=27, Cu=29, Ni=28), the colourless species are :
- (a)
TiF2- and Cu2CI2
- (b)
Cu2CI2 and NiCI42-
- (c)
TiF62- and CoF62-
- (d)
CoF63- and NiCI42-
which one of the following species has green colour ?
- (a)
MnO42-
- (b)
MnO4
- (c)
Cr2O73-
- (d)
NONE OF THESE
Point out the incorrect statement regarding transition elements. The have
- (a)
high m.p. and high b.p
- (b)
high densities
- (c)
high thermal and electrical conducctivity
- (d)
low tensile strength
which of the following statements about chromium group is not true?
- (a)
The chromium group elements form basic oxides
- (b)
The oxy-chromium group metals are hydrolysed to have oxy-acids.
- (c)
The metals of chromium group are Cr, MO and N
- (d)
The important oxidation state of chromium group is +3
which one of the following is not a condition for complex formation?
- (a)
variable oxidation states
- (b)
small size
- (c)
higher nuclear charge
- (d)
availability of vacant d-orbitals
d-block elements form coloured ions because, they
- (a)
absorb some energy for d-s transition
- (b)
absorb some energy d-d transition
- (c)
absorb some energy for p-d transition
- (d)
do not absorb any energy
The first ionisation energy of copper is higher than that of sodium because
- (a)
copper is a non-transitional elements
- (b)
d-electron have lesser screening effect
- (c)
an electron is removed from a s-orbital
- (d)
the force of attraction between the electron and nucleus in a copper atom is greater than that in a sodium atom.
The traditionl elements exhibit variables oxidate state because
- (a)
they have high ionisation energies
- (b)
penultimate d-orbitals can enter into chemical bond formation
- (c)
they are highly metallic in nature
- (d)
they are present between s and p-block elements
On heating a mixture of chrome iron and carbon in an electric furnace, the product formed is
- (a)
bronze
- (b)
invar
- (c)
ferro-chrome
- (d)
stainless steel
In the transition elements the incoming electrons occupies (n-1)d sub-level in preference to
- (a)
np
- (b)
ns
- (c)
(n-1)
- (d)
(n+1)