F-Block Elements MCQs [Chemistry]

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

  1. Zr and Y have about the same radius
  2. Zr and Nb have similar oxidation states
  3. Zr and Zn have the same oxidation state
  4. 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?

  1. 12
  2. 15
  3. 14
  4. 13

Question’s Answer: 15

Which of the mentioned are important minerals of lanthanides?

  1. Xenotime
  2. Euxenite
  3. Monazite
  4. All A, B, and C

Question’s Answer: All A, B, and C

What is the % of Ce-earths in Monazite?

  1. 50-70%
  2. 50-60%
  3. 40-50%
  4. 30-40%

Question’s Answer: 50-70%

Which of the mentioned statements is not true with regard to misch metals use?

  1. These are used to produce bullets shell
  2. These are used to produce lighter flints
  3. The traces of Cs and Na are present in misch metals
  4. 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

  1. Fractional precipitation
  2. Fractional crystallization
  3. All A, B, and C

Question’s Answer: All A, B, and C

Which of the mentioned modern methods is used to separate lanthanides?

  1. TLC
  2. Complex formation
  3. Ion-exchange
  4. 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.

  1. s block elements
  2. f-block elements
  3. p block elements
  4. d-block elements

Question’s Answer: f-block elements

What is the another name for 4f block elements?

  1. Rare-earths
  2. Lanthanones
  3. Lanthanides
  4. All A, B, and C

Question’s Answer: All A, B, and C

The +2 and +4 oxidation sates is shown by which lanthanides

  1. Ce
  2. Sm
  3. Er
  4. Lu

Question’s Answer: Sm

The lanthanide contraction is due to decrease in

  1. Electron affinity
  2. Metallic character
  3. Electronegativity
  4. Ionic size

Question’s Answer: Ionic size

Which of the mentioned is not member of lanthanides?

  1. Ca
  2. Sm
  3. Gd
  4. 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?

  1. Actinones
  2. Actinides
  3. 5f-block elements
  4. All A, B, and C

Question’s Answer: All A, B, and C

Which of the mentioned does not belong to actinides?

  1. Bk
  2. Am
  3. Es
  4. Th

Question’s Answer: Th

Which of the mentioned organic solvents is commonly used for separation of actinides?

  1. Diethyl ether
  2. Hexone
  3. TBP
  4. 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?

  1. Pu
  2. Am
  3. Np
  4. 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?

  1. Thi
  2. Am
  3. U
  4. Ac

Question’s Answer: Am

Which of the mentioned elements shows only +4 oxidation state among the actinides?

  1. Th
  2. Ac
  3. U
  4. Am

Question’s Answer: Th

What is the % of Ye-earths in Xenotime?

  1. 50-60%
  2. 40-50%
  3. 54-65%
  4. 30-40%

Question’s Answer: 54-65%

What is the location of significant deposits of lanthanides?

  1. South Africa
  2. Brazil
  3. USA
  4. All A, B, and C

Question’s Answer: All A, B, and C

Which of the mentioned is not a member of lanthanides?

  1. La
  2. Sm
  3. Nd
  4. Ba

Question’s Answer: Ba

Which of the mentioned elements shows only +3 oxidation state among the actinides?

  1. Th
  2. Fm
  3. U
  4. U

Question’s Answer: Fm

Which of the mentioned elements shows color spectra among the actinides?

  1. Pu
  2. Np
  3. U
  4. 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

  1. Different shapes of f-orbitals
  2. The attraction of ns² electrons by the nucleus
  3. Efficient shielding of f-orbitals for the attraction of ns² electrons by the nucleus
  4. 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?

  1. Lu(OH)3
  2. Sm(OH)3
  3. Er(OH)3
  4. La(OH)3

Question’s Answer: La(OH)3

Which of the mentioned elements shows maximum number of different oxidation states in its compounds?

  1. Am
  2. La
  3. Eu
  4. Gd

Question’s Answer: Am

Which of the mentioned statements is false?

  1. In lanthanide the ionic of Ln3+ ion decreases
  2. La(OH) 3 is less basic than Lu(OH)3
  3. La is an element of transition series
  4. 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 _________.

  1. metal
  2. Auer metal
  3. Brass
  4. Zircona

Question’s Answer: Auer metal

Which of the mentioned statements is not true with regard to actinides?

  1. Ac usually shows oxidation state of 5+
  2. They are radioactive and toxic to humans
  3. Their nuclear stability decreases with increasing atomic number
  4. 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?

  1. Monazite
  2. Cerite
  3. Bastaesite
  4. Euxenite

Question’s Answer: Euxenite

Which of the mentioned minerals is not belonging to carbonate group?

  1. Parasite
  2. Ancylite
  3. Euxenite
  4. Bastaesite

Question’s Answer: Euxenite

Which of the mentioned minerals is not belonging to phosphate group?

  1. Monazite
  2. Britholite
  3. Bastaesite
  4. Xenotimec

Question’s Answer: Monazite

Which of the mentioned statements is not true with regard to lanthanides?

  1. Lanthanides are very reactive metals
  2. Lanthanides are very strong reducing agents
  3. Most of the compounds of lanthanides are paramagnetic
  4. 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?

  1. Er3+
  2. Ce3+
  3. Sm3+
  4. Eu3+

Question’s Answer: Ce3+

The color of lanthanides is due to

  1. f-f transitions
  2. d-d transitions
  3. s-p transitions
  4. d-f transitions

Question’s Answer: d-d transitions

The alloys of lanthanides are known as

  1. Coinage metals
  2. Precious metals
  3. Mish metals
  4. 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?

  1. Monazite
  2. Euxenite
  3. Gadolinite
  4. Xenotime

Question’s Answer: Monazite

Which of the mentioned statements is not true with regard to lanthanides?

  1. Lanthanides are silvery white soft metals
  2. Basicity of lanthanide decreases with increase in atomic number
  3. Most of the trivalent ions are colored
  4. 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?

  1. Brass
  2. Bronze
  3. Misch metals
  4. Steel

Question’s Answer: Misch metals

A typical misch metal consists of

  1. Lanthanide metal -80% and iron-20%
  2. Lanthanide metal -85% and iron-15%
  3. Lanthanide metal ~95% and iron-5%
  4. Lanthanide metal -50% and iron-50%

Question’s Answer: Lanthanide metal ~95% and iron-5%

The lanthanides are used in

  1. Abrasives
  2. Nuclear industry
  3. Paints
  4. All A, B, and C

Question’s Answer: All A, B, and C

The common oxidation state of lanthanides is

  1. +1
  2. +3
  3. +2
  4. +5

Question’s Answer: +3

More Inorganic Chemistry MCQs

  1. Chemical Bonding MCQs
  2. Acids and Bases in inorganic chemistry MCQs
  3. Boron And Aluminum MCQs
  4. Carbon and Silicon MCQs
  5. Hydrogen, Alkali, and Alkaline Earth Metals MCQs
  6. D-Block Elements MCQs [Chemistry]
  7. F-Block Elements MCQs
  8. Halogens MCQs
  9. Inert Gases MCQs
  10. Nitrogen and Phosphorus MCQs
  11. Oxygen and Sulphur MCQs
  12. Experimental Inorganic Chemistry MCQs
  13. Periodic Classification Of Elements And Periodicity Of Properties MCQs
  14. CHEMISTRY MCQs From all subjects of  Chemistry

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