Chemistry - d and f Block Elements
Exam Duration: 45 Mins Total Questions : 30
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 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
Among the following elements, the element with lowest enthalpy of atomisations
- (a)
Sc
- (b)
Cr
- (c)
Cu
- (d)
Zn
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
The lanthanoid contraction is related to
- (a)
atomic radii
- (b)
atomic as well as ionic radii, M3+
- (c)
valence electrons
- (d)
oxidation states
There are 14 elements in actinoid series. Which of the following elements does not belong to this series?
- (a)
U
- (b)
Np
- (c)
Tm
- (d)
Fm
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
Among the following elements, the element with half-filled f-orbital is
- (a)
lutetium
- (b)
gadolinium
- (c)
lawrencium
- (d)
tantalum
The element with maximum number of oxidation states in their compounds is
- (a)
Eu
- (b)
La
- (c)
Gd
- (d)
Am
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.
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
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