Set of Important MCQs on Chemistry of F-Block Elements in inorganic chemistry for the preparation of tests.
The lanthanides contraction is responsible for the fact that
- Zr and Y have about the same radius
- Zr and Nb have similar oxidation states
- Zr and Zn have the same oxidation state
- Zr and Hf have about the same radius
Question’s Answer: Zr and Hf have about the same radius
How many elements are members of lanthanides?
- 12
- 15
- 14
- 13
Question’s Answer: 15
Which of the mentioned are important minerals of lanthanides?
- Xenotime
- Euxenite
- Monazite
- All A, B, and C
Question’s Answer: All A, B, and C
What is the % of Ce-earths in Monazite?
- 50-70%
- 50-60%
- 40-50%
- 30-40%
Question’s Answer: 50-70%
Which of the mentioned statements is not true with regard to misch metals use?
- These are used to produce bullets shell
- These are used to produce lighter flints
- The traces of Cs and Na are present in misch metals
- These are used in petroleum cracking
Question’s Answer: The traces of Cs and Na are present in misch metals
Which of the mentioned classical methods is used to separate lanthanides?
A Fractional thermal decomposition
- Fractional precipitation
- Fractional crystallization
- All A, B, and C
Question’s Answer: All A, B, and C
Which of the mentioned modern methods is used to separate lanthanides?
- TLC
- Complex formation
- Ion-exchange
- All A, B, and C
Question’s Answer: All A, B, and C
Which are the elements in which the additional electron enters (n-2) f orbital.
- s block elements
- f-block elements
- p block elements
- d-block elements
Question’s Answer: f-block elements
What is the another name for 4f block elements?
- Rare-earths
- Lanthanones
- Lanthanides
- All A, B, and C
Question’s Answer: All A, B, and C
The +2 and +4 oxidation sates is shown by which lanthanides
- Ce
- Sm
- Er
- Lu
Question’s Answer: Sm
The lanthanide contraction is due to decrease in
- Electron affinity
- Metallic character
- Electronegativity
- Ionic size
Question’s Answer: Ionic size
Which of the mentioned is not member of lanthanides?
- Ca
- Sm
- Gd
- Lu
Question’s Answer: Ca
Which of the following are the elements in which the extra electron enters 5f-orbitals of the (n-2)th main shell?
- Actinones
- Actinides
- 5f-block elements
- All A, B, and C
Question’s Answer: All A, B, and C
Which of the mentioned does not belong to actinides?
- Bk
- Am
- Es
- Th
Question’s Answer: Th
Which of the mentioned organic solvents is commonly used for separation of actinides?
- Diethyl ether
- Hexone
- TBP
- All A, B, and C
Question’s Answer: All A, B, and C
Which of the mentioned elements shows maximum variable oxidation states among the actinides?
- Pu
- Am
- Np
- All A, B, and C
Question’s Answer: All A, B, and C
Which of the mentioned elements shows +2 oxidation states among the actinides?
- Thi
- Am
- U
- Ac
Question’s Answer: Am
Which of the mentioned elements shows only +4 oxidation state among the actinides?
- Th
- Ac
- U
- Am
Question’s Answer: Th
What is the % of Ye-earths in Xenotime?
- 50-60%
- 40-50%
- 54-65%
- 30-40%
Question’s Answer: 54-65%
What is the location of significant deposits of lanthanides?
- South Africa
- Brazil
- USA
- All A, B, and C
Question’s Answer: All A, B, and C
Which of the mentioned is not a member of lanthanides?
- La
- Sm
- Nd
- Ba
Question’s Answer: Ba
Which of the mentioned elements shows only +3 oxidation state among the actinides?
- Th
- Fm
- U
- U
Question’s Answer: Fm
Which of the mentioned elements shows color spectra among the actinides?
- Pu
- Np
- U
- All A, B, and C
Question’s Answer: All A, B, and C
The decrease in ionic radii of lanthanides in row is due to
- Different shapes of f-orbitals
- The attraction of ns² electrons by the nucleus
- Efficient shielding of f-orbitals for the attraction of ns² electrons by the nucleus
- Inefficient shielding of f-orbitals for the attraction of ns² electrons by the nucleus
Question’s Answer: Inefficient shielding of f-orbitals for the attraction of ns² electrons by the nucleus
Which of the mentioned hydroxides is more basic?
- Lu(OH)3
- Sm(OH)3
- Er(OH)3
- La(OH)3
Question’s Answer: La(OH)3
Which of the mentioned elements shows maximum number of different oxidation states in its compounds?
- Am
- La
- Eu
- Gd
Question’s Answer: Am
Which of the mentioned statements is false?
- In lanthanide the ionic of Ln3+ ion decreases
- La(OH) 3 is less basic than Lu(OH)3
- La is an element of transition series
- Zr and Hf have about the same radius due to lanthanide contraction
Question’s Answer: La(OH) 3 is less basic than Lu(OH)3
An alloy of cerium and iron is known as _________.
- metal
- Auer metal
- Brass
- Zircona
Question’s Answer: Auer metal
Which of the mentioned statements is not true with regard to actinides?
- Ac usually shows oxidation state of 5+
- They are radioactive and toxic to humans
- Their nuclear stability decreases with increasing atomic number
- Actinides are heavy metals
Question’s Answer: Ac usually shows oxidation state of 5+
Which of the mentioned minerals is not a member of cerium group of minerals?
- Monazite
- Cerite
- Bastaesite
- Euxenite
Question’s Answer: Euxenite
Which of the mentioned minerals is not belonging to carbonate group?
- Parasite
- Ancylite
- Euxenite
- Bastaesite
Question’s Answer: Euxenite
Which of the mentioned minerals is not belonging to phosphate group?
- Monazite
- Britholite
- Bastaesite
- Xenotimec
Question’s Answer: Monazite
Which of the mentioned statements is not true with regard to lanthanides?
- Lanthanides are very reactive metals
- Lanthanides are very strong reducing agents
- Most of the compounds of lanthanides are paramagnetic
- The coordination number of lanthanides is small.
Question’s Answer: The coordination number of lanthanides is small.
Which of the mentioned members of lanthanides has larger ionic radius?
- Er3+
- Ce3+
- Sm3+
- Eu3+
Question’s Answer: Ce3+
The color of lanthanides is due to
- f-f transitions
- d-d transitions
- s-p transitions
- d-f transitions
Question’s Answer: d-d transitions
The alloys of lanthanides are known as
- Coinage metals
- Precious metals
- Mish metals
- None of A, B, and C
Question’s Answer: Mish metals
Which of the mentioned minerals is not a member of yttrium group of minerals?
- Monazite
- Euxenite
- Gadolinite
- Xenotime
Question’s Answer: Monazite
Which of the mentioned statements is not true with regard to lanthanides?
- Lanthanides are silvery white soft metals
- Basicity of lanthanide decreases with increase in atomic number
- Most of the trivalent ions are colored
- The hardness of metals decreases with an increase in atomic number
Question’s Answer: The hardness of metals decreases with an increase in atomic number
Which of the following are the alloys of lanthanides with other metals?
- Brass
- Bronze
- Misch metals
- Steel
Question’s Answer: Misch metals
A typical misch metal consists of
- Lanthanide metal -80% and iron-20%
- Lanthanide metal -85% and iron-15%
- Lanthanide metal ~95% and iron-5%
- Lanthanide metal -50% and iron-50%
Question’s Answer: Lanthanide metal ~95% and iron-5%
The lanthanides are used in
- Abrasives
- Nuclear industry
- Paints
- All A, B, and C
Question’s Answer: All A, B, and C
The common oxidation state of lanthanides is
- +1
- +3
- +2
- +5
Question’s Answer: +3
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