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20 Questions MCQ Test | Test: Lanthanide- 1

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Test: Lanthanide- 1 - Question 1

Due to lanthanide contraction:

Detailed Solution for Test: Lanthanide- 1 - Question 1
  • Lanthanide contraction is the gradual decrease in the atomic and ionic size of lanthanoids with an increase in atomic number.
  • The Lanthanide Contraction is caused by a poor shielding effect of the 4f electrons.
Test: Lanthanide- 1 - Question 2

Which of the following statements concerning lanthanides elements is false:

Test: Lanthanide- 1 - Question 3

Which of the following statements is not correct:

Detailed Solution for Test: Lanthanide- 1 - Question 3
  • Due to lanthanide contraction as the size of lanthanide ions decreases from La3+ to Lu3+, the covalent character of the hydroxides increases, and hence the basic strength decreases. 
  • Thus, La(OH)3 is the most basic, and Lu(OH)3 is the least basic.
Test: Lanthanide- 1 - Question 4

The lanthanide contraction is responsible for the fact that:

Detailed Solution for Test: Lanthanide- 1 - Question 4
  • Lanthanide contraction is the gradual decrease in the atomic and ionic size of lanthanoids with an increase in atomic number.
  • The Lanthanide Contraction is caused by a poor shielding effect of the 4f electrons.
Test: Lanthanide- 1 - Question 5

The electronic configuration of (Gd) (At. No. 64) is:

Detailed Solution for Test: Lanthanide- 1 - Question 5
  • Lanthanides of the first f-block have a terminal electronic configuration:
    [Xe] 4f1-14 5d0-1 6s2.
  • There is an exception in the case of gadolinium, Gd (Z = 64) where the electron enters the 5d orbital due to the presence of half-filled d-orbital
Test: Lanthanide- 1 - Question 6

Which one of the following elements shows maximum number of different oxidation states in its compounds:

Detailed Solution for Test: Lanthanide- 1 - Question 6
  • 'La' forms compounds in which its oxidation no. is +3.
  • 'Eu' and 'Gd' exhibit +2 as well as +3 oxidation state and not higher than that. due to stable (f7) configuration.
  • 'Am' exhibits the oxidation states +2, +3, +4, +5, +6, etc. due to extremely large size and low ionization energy.
Test: Lanthanide- 1 - Question 7

Cerium (Z = 58) is an important member of lanthanides. Which of the following statements about cerium is incorrect:

Detailed Solution for Test: Lanthanide- 1 - Question 7
  • The incorrect statement about the Cerium is only the B option.
    B: The +4 oxidation state of cerium is not known in solutions.
    As +4 oxidation state, is common for the Cerium.
  • The correct statements about the Cerium are as follows:
    A: Cerium (IV) acts as an oxidizing agent
    C: The common oxidation state of Cerium are +3 and +4.
    D: The +3 oxidation state of the Cerium is more stable than the +4 oxidation state.
Test: Lanthanide- 1 - Question 8

Which of the following factors may be regarded as the main cause of lanthanide contraction:

Detailed Solution for Test: Lanthanide- 1 - Question 8
  • Lanthanide contraction is the gradual decrease in the atomic and ionic size of lanthanoids with an increase in atomic number.
  • The Lanthanide Contraction is caused by a poor shielding effect of the 4f electrons.
Test: Lanthanide- 1 - Question 9

The lanthanide contraction is due to:

Test: Lanthanide- 1 - Question 10

Ln3+ (trivalent lanthanides ions) have electronic configurations:

Detailed Solution for Test: Lanthanide- 1 - Question 10
  • Lanthanides have the configuration of [Xe]4f1−14 5d6s2
  • So their trivalent ion has the configuration of [Xe]4fto [Xe]4f14
Test: Lanthanide- 1 - Question 11

The common oxidation state of the elements of lanthanide series is:

Detailed Solution for Test: Lanthanide- 1 - Question 11
  • Lanthanides show variable oxidation states.
  • The most stable oxidation state of Lanthanides is +3.
  • They also show +2 and +4 oxidation states due to the presence of either half-filled or completely filled or empty 4f sub-shell.
Test: Lanthanide- 1 - Question 12

Lanthanide for which +II and +III oxidation states are common is:

Detailed Solution for Test: Lanthanide- 1 - Question 12
  • Lanthanoid for which +2 and +3 oxidation states are common is Eu.
  • La has +3 oxidation state. Ce has +3 and +4 oxidation states. Nd has +2, +3 and +4 oxidation state.
Test: Lanthanide- 1 - Question 13

Which of the following ions is paramagnetic:

Test: Lanthanide- 1 - Question 14

The separation of lanthanides in ion exchange method is based on:

Test: Lanthanide- 1 - Question 15

Which of the following forms stable + 4 oxidation state:

Detailed Solution for Test: Lanthanide- 1 - Question 15

The common oxidation state of Cerium are +3 and +4.

Test: Lanthanide- 1 - Question 16

Zr and Hf have similar atomic and ionic radii because:

Detailed Solution for Test: Lanthanide- 1 - Question 16
  • Lanthanide contraction is the gradual decrease in the atomic and ionic size of lanthanoids with an increase in atomic number.
  • The Lanthanide Contraction is caused by a poor shielding effect of the 4f electrons.
Test: Lanthanide- 1 - Question 17

In general, the configuration of lanthanides is (n – 2) f1-14 (n – 1) s2 p6 d1or 0 ns2. It is observed that, with increase in atomic number of lanthanides, there is a decrease of ionic radii from La : 122 to Lu : 0.99 (Å).

Test: Lanthanide- 1 - Question 18

The properties of zirconium and hafnium atoms and ions are almost the same because both:

Detailed Solution for Test: Lanthanide- 1 - Question 18

The atomic radius of the metal zirconium, Zr, (a period-5 transition element) is 159 pm and that of hafnium, Hf, (the corresponding period-6 element) is 156 pm. The ionic radius of Zr4+ is 79 pm and that of Hf4+ is 78 pm. The radii are very similar even though the number of electrons increases from 40 to 72 and the atomic mass increases from 91.22 to 178.49 g/mol.

This is due to Lanthanide contraction i.e. greater-than-expected decrease in ionic radii of the elements in the lanthanide series from atomic number 57, lanthanum, to 71, lutetium, which results in smaller than otherwise expected ionic radii 

Test: Lanthanide- 1 - Question 19

Which of the following is correct term-symbol of Ce3+ (4f1):

Test: Lanthanide- 1 - Question 20

What would be magnetic moment of Gd+3 (Z=64)?

Detailed Solution for Test: Lanthanide- 1 - Question 20

Correct option is B)

Electronic configuration of [Gd]3+:[Xe]4f7

Hence number of unpaired electron n=7

Hence, magnetic moment=n(n+2)​=63​=7.9BM

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