JEE Chemistry- d-& f-block Element Sample Question Paper With Answer Key
Exam Duration: 60 Mins Total Questions : 30
The number of unpaired electrons present in Ni2+ is
- (a)
8
- (b)
4
- (c)
2
- (d)
0
A transition metal in its highest oxidation state act as
- (a)
reducing agent
- (b)
an oxidising agent
- (c)
a chelating agent
- (d)
a central metal in a coordination compound
Which of the following does not show any colour in solution?
- (a)
V3+
- (b)
Co2+
- (c)
Cr3+
- (d)
Sc3+
Zinc does not exhibit variable valency due to
- (a)
presence of complete filled d-orbitals
- (b)
inert pair effect
- (c)
presence of 4s-orbitals
- (d)
None of the above
Which of the following pair of compounds shows similar colour in aqueous medium?
- (a)
FeCl2 and MnCl2
- (b)
COCl2 and CuCl2
- (c)
VOCl2 and feCl2
- (d)
FeCl3 and CuCl2
Gadolinium belongs to 4f-series. It's atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?
- (a)
[Xe]4f7, 5d16s2
- (b)
[Xe]4f6, 5d26s2
- (c)
[Xe]4f8, 6d2
- (d)
[Xe]4f9, 5d1
Metallic radii of some transition elements are given below. Which of these element will have highest density?
| Element | Fe | Co | Ni | Cu |
|---|---|---|---|---|
| Metallic radii/pm | 126 | 125 | 125 | 128 |
- (a)
Fe
- (b)
Ni
- (c)
Co
- (d)
Cu
The basicity of lanthanoid hydroxides, across the lanthanoid series
- (a)
decreases
- (b)
increases
- (c)
first decreases and then increases
- (d)
first increases and then decreases
Among the following lanthanoid ions, the paramagnetic ion is
- (a)
Yb2+
- (b)
Eu2+
- (c)
Lu3+
- (d)
Ce4+
The lanthanoid contraction is related to
- (a)
atomic radii
- (b)
atomic as well as ionic radii, M3+
- (c)
valence electrons
- (d)
oxidation states
Actinoids possess
- (a)
variable valency
- (b)
12 elements
- (c)
all synthetic elements
- (d)
only short-lived isotopes
Match the following and choose the correct option
| Column I | Column II | ||
|---|---|---|---|
| A. | Y3+ | i | 4 |
| B | La3+ | ii | 1 |
| C | Ac3+ | iii | 3 |
| D | Sc3+ | iv | 2 |
- (a)
A B C D 3 4 2 1 - (b)
A B C D 4 3 1 2 - (c)
A B C D 4 1 2 3 - (d)
A B C D 3 2 1 4
Among the following given electronic configuration of d-orbitals the electronic configuration showing highest magnetic moment is
- (a)
3d2
- (b)
3d5
- (c)
3d7
- (d)
3d8
A transition metal ion possess a magnetic moment of \(\sqrt{15}\)BM, the number of unpaired electrons present in this metal ion is
- (a)
1
- (b)
2
- (c)
3
- (d)
4
Identify the correct statement.
- (a)
Co3+ is most stable in octahedral complexes than tetrahedral
- (b)
Zn forms coloured complexes
- (c)
Compounds formed by d-block elements are generally ferromagnetic
- (d)
Osmium shows +6 oxidation state
For the ions, Cu2+(3d9) and Cu+(3d10), the correct statement is
- (a)
Cu2+ is more stable than cu+
- (b)
Cu2+ is less stable than Cu+
- (c)
Cu2+ and Cu+ ions are equally stable
- (d)
Stability of Cu+ and Cu2+ depends on the nature of copper salts
The purple colour of KMnO4 is due to
- (a)
resonance in MnO4- ion
- (b)
charge transfer
- (c)
ionic nature of KMnO4
- (d)
partially filled d-orbitals
KMnO4 acts as oxidising agent in acidic medium. The number o moles of KmnO4 that will be needed to react with one mole of sulphide ions in acidic solution is
- (a)
\(2\over 5\)
- (b)
\(3\over 5\)
- (c)
\(4\over 5\)
- (d)
\(1\over 5\)
The addition of acidified K2Cr2O7 solution to Sn2+ salts, causes a change of Sn2+ to
- (a)
Sn+
- (b)
Sn3+
- (c)
Sn4+
- (d)
Sn
The incorrect statement in reference to 3d and 4f series element is
- (a)
3d elements show large number o oxidation states than 4f series elements
- (b)
energy difference between 3d and 4f-orbitals in very small
- (c)
Eu2+ is more stable than Ce2+
- (d)
paramagnetic character increases from Sc to Zn in 3d series.
Which series of reactions correctly represents chemical relations related to iron and its compound?
- (a)
\(Fe\overset { Dil.H_{ 2 }SO_{ 4 } }{ \longrightarrow } FeSO_{ 4 }\overset { H_{ 2 }SO_{ 4 },O_{ 2 } }{ \longrightarrow } Fe_{ 2 }(SO_{ 4 })_{ 3 }\overset { Heat }{ \longrightarrow } Fe\)
- (b)
\(Fe\overset { O_{ 2 }heat }{ \longrightarrow } FeO\overset { Dil\quad H_{ 2 }SO_{ 4 } }{ \longrightarrow } Fe_{ 2 }SO_{ 4 }\overset { Heat }{ \longrightarrow } Fe\)
- (c)
\(Fe\overset { Cl_{ 2 }heat }{ \longrightarrow } FeCl_{ 3 }\overset { Heat,air }{ \longrightarrow } FeCl_{ 4 }\overset { Zn }{ \longrightarrow } Fe\)
- (d)
\(Fe\overset { O_{ 2 }heat }{ \longrightarrow } Fe_{ 3 }O_{ 4 }\overset { CO,600^{ o }C }{ \longrightarrow } FeO\overset { CO,700^{ o }C }{ \longrightarrow } Fe\)
Which of the following arrangements does not represent the correct order of the property stated against it?
- (a)
V2+ < Cr2+
- (b)
Ni2+ < Co2+ < Fe2+ < Mn2+ ionic size
- (c)
Co3+
- (d)
Sc< Ti
Four successive members of the first row transition elements listed below with atomic numbers. Which of them is expected to have the highest EoM3+/M2+ value?
- (a)
Cr(Z=24)
- (b)
Mn(Z=25)
- (c)
Fe(Z=26)
- (d)
Co(Z=27)
The outer electron configuration of Gd (Atomic number 64) is
- (a)
4f35d56s2
- (b)
4f8 5d0 6s2
- (c)
4f4 5f4 6s2
- (d)
4f7 5d1 6s2
In context of the lanthanoids, which of the following statements is not correct?
- (a)
There is a gradual decrease in the radii of the members with increasing atomic number in the series.
- (b)
All the members exhibit +3 oxidation state.
- (c)
Because of similar properties the separation of lanthanoids is not easy
- (d)
Availability of 4f electrons results in the formation of compounds in +4 state for all the members of the series.
The correct order of \(E^o_{M^{2+}/M}\) values with negative sign for the four successive elements Cr, Mn, Fe and Co is
- (a)
Mn > Cr > Fe > Co
- (b)
Cr > Fe > Mn > Co
- (c)
Fe > Mn > Cr > Co
- (d)
Cr > Mn > Fe > Co
Large number of oxidation states are exhibited by the antinoids than those by the lanthanoids, the main reason being
- (a)
4f orbitals more diffused than the 5f orbitals
- (b)
lesser energy difference between 5f and 6d than between 4f and 5d-orbitals.
- (c)
more energy difference between 5f and 6d orbitals than between 4f and 5d orbitals
- (d)
more reactive nature of the actinoids than the lanthanoids
Lanthanoid contraction is caused due to
- (a)
the appreciable shielding on outer electrons by 4f electrons from the nuclear charge.
- (b)
the appreciable shielding on outer electrons by 5d electrons from the nuclear charge
- (c)
the same effective nuclear charge from Ce to Lu
- (d)
the imperfect shielding on outer electrons by 4f electrons from the nuclear charge
Cerium (Z=58) is an important member of the lanthanides. Which of the following statements about cerium is incorrect?
- (a)
The common oxidation states of cerium are +3 and +4
- (b)
The +3 oxidation state of cerium is more stable than the +4 oxidation state
- (c)
The +4 oxidation state of cerium is not known in solutions
- (d)
Cerium (IV) acts as an oxidising agent
Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them?
- (a)
(n-1)d8ns2
- (b)
(n-1)d5ns1
- (c)
(n-1)d3ns2
- (d)
(n-1)d5ns2
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