JEE Main Chemistry - d and f Block Elements
Exam Duration: 60 Mins Total Questions : 30
Electonic configuration of a transition element X in +3 oxidation state is [Ar]3d5. What is its atomic number?
- (a)
25
- (b)
26
- (c)
27
- (d)
24
Among the following, the compound that does not exist is
- (a)
K2TiO4
- (b)
K2TiF6
- (c)
TiO2
- (d)
TiCl4
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 belong to 3d-transition series?
- (a)
Fe
- (b)
Cu
- (c)
Au
- (d)
Co
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
For d-block elements, the first ionisation potential is in the order of
- (a)
Zn
- (b)
V>Cr>Mn>Fe
- (c)
Zn>Fe>Cu>Cr
- (d)
Sc>Ti>V>Cr
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
Which of the following ion act as an oxidising agent?
- (a)
Eu2+
- (b)
Np4+
- (c)
Sm2+
- (d)
Yb2+
Lanthanoids and actinoids differ from each other because
- (a)
of the presence of partially filled outermost shells
- (b)
actinoids are radioactive in nature
- (c)
they show common oxidation state of +3
- (d)
both are known as inner transition elements
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
The colour o the compound containing Ti3+ ion is purple. It absorbs the wavelength of complement colour of
- (a)
blue
- (b)
green
- (c)
red
- (d)
greenish yellow
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)
\(1\over 5\)
Although zirconium belongs to 4d transition series and Hafnium to 5d transition series even then, they show similar physical and chemical properties because .........
- (a)
both belongs to d-block
- (b)
both have same number of electrons
- (c)
both have similar atomic radius
- (d)
both belong to the same group of the periodic table
The element with maximum number of oxidation states in their compounds is
- (a)
Eu
- (b)
La
- (c)
Gd
- (d)
Am
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)
\(Fe\overset { O_{ 2 }heat }{ \longrightarrow } Fe_{ 3 }O_{ 4 }\overset { CO,600^{ o }C }{ \longrightarrow } FeO\overset { CO,700^{ o }C }{ \longrightarrow } Fe\)
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)
Iron exhibits +2 and +3 oxidation states. Which of the following statements about iron is incorrect?
- (a)
Ferrous oxide is more basic in nature than the ferric oxide
- (b)
Ferrous compounds are relatively more ionic than the corresponding ferric compounds
- (c)
Ferrous compounds are less volatile than the corresponding ferric compounds
- (d)
Ferrous compounds are more easily hydrolysed than the corresponding ferric compounds
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
Calomel (Hg2Cl2) on reaction with NH4OH gives
- (a)
HgO
- (b)
Hg2O
- (c)
NH2 - Hg - Hg - Cl
- (d)
HgNH2Cl
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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