InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
The colour of the transition metal ions is/are due to:A. f-f transitionsB. crystal field splittingC. full f-orbitalsD. partially filled d-subshell |
| Answer» Correct Answer - A | |
| 52. |
Which of the following Lanthanoid is radioactiveA. CeriumB. PromethiumC. ThuliumD. Lutetium |
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Answer» Correct Answer - B |
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| 53. |
Which of the following are all radioactive elements.A. Transition elements.B. P block elementsC. Lathanides.D. Actinides. |
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Answer» Correct Answer - D |
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| 54. |
Lanthanoid contraction occurs becauseA. the 4f electrons, which are gradually added, create a strong shielding effectB. the 4f orbitals are greater in size than the 3d and 3f orbitalsC. the 5f orbitals strongly penetrate into the 4f orbitalsD. the poor shielding effect of 4f electrons is coupled with increased attraction between the nucleus and the added electrons. |
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Answer» Correct Answer - D |
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| 55. |
Non-Lanthanoid atom isA. LaB. LuC. PrD. Pm |
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Answer» Correct Answer - A |
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| 56. |
Lanthanides are characterized by the filing of theA. penultimate 4f energy levelB. antepenultimate 4f energy levelC. penultimate 5f energy levelD. antepenultimate 5f energy level |
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Answer» Correct Answer - B |
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| 57. |
Which of the following is a LanthanoidA. TaB. RhC. ThD. Lu |
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Answer» Correct Answer - D |
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| 58. |
The stable +2 ions of lanthanides in aqeous solution areA. `Eu^(2+)`B. `Ce^(2+)`C. `Lu^(3+)`D. `Fe^(2+)` |
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Answer» Correct Answer - A |
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| 59. |
Pair of ions which are having same number of unpaired electronsA. `Eu^(3+), Tb^(3+)`B. `Eu^(3+), Ce^(3+)`C. `Eu^(3+), Sm^(3+)`D. `Eu^(3+), Pr^(3+)` |
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Answer» Correct Answer - A |
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| 60. |
Identify the incorrect statement among the following :A. d-block element show irregular and erratic chemical properties among themselvesB. La and Lu have partially filled d-orbitals and no therpartially filled orbitalsC. The chemistry of various lanthanoids is very similarD. 4f - and 5f - orbitals are equally shielded |
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Answer» Correct Answer - D |
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| 61. |
Identify the incorrect statement among the following :A. d-block elements show irregular and erratic chemical properties among themselvesB. La and Lu hae partially filled d-orbitals filled d-orbitals and no other partially filled orbitalsC. The chemistry of various lanthanoids is very similarD. 4f and 5f-orbitals are equally shielded |
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Answer» Correct Answer - D 4f is shielded more than 5f-orbital. |
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| 62. |
Crystal field stabilization is important for :A. d-block elementsB. f-block elementsC. p-block elementsD. both (a) and (b) |
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Answer» Correct Answer - A `Delta_(0)` for f-orbitals `~= 1 kJ//mol` |
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| 63. |
The actinoids exhibit more number of oxidation states in general than the lanthanoids. This is becauseA. the 5f-orbitals are more buried than the 4f-orbitalsB. there is a similarity between 4f and 5f in their angular part of the wave functionC. the actinoids are more reactive than the lanthanoidsD. the 5f-orbitals extend further from the nucleus than the 4f-orbitals |
| Answer» Correct Answer - D | |
| 64. |
Select the correct statements (s) for the comparision of lanthanoids with actinoids.A. Actinoids contraction is greater from element to element due to poor shielding by 5 f electronsB. Magnetic properties of actinoids are more complex, with corresponding lanthanides having higher valuesC. Lanthanoids have higher I.E.D. All of the above |
| Answer» Correct Answer - D | |
| 65. |
Larger number of oxidation states are exhibited by the actinoids then those by the lanthanoids, the main reason beingA. the 4f orbitals are more diffused than the 5f orbitalsB. lesser energy difference between 5f and 6d than between 4f and 5d orbitalsC. more energy diference between 5f and 6d than between 4f and 5d orbitalsD. more reactive nature of actinids than that of lanthanoids |
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Answer» Correct Answer - B |
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| 66. |
`KMnO_(4)` and `K_(2)Cr_(2)O_(7)` are replaced in volumetric analysis byA. La(III) saltsB. Ce(III)saltsC. Ce(IV)saltD. Gd(III)salts |
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Answer» Correct Answer - C |
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| 67. |
Statement - I :- `Sm^(3+), Dy^(3+)` have same colour (yellow) Statement - II :- Both ions are having same nupaired electronsA. Statement I is true, Statement II is true, Statement II is a correct explanation of Statement I.B. Statement I is true, Statement II is true, Statement II is not the correct explanation of statement IC. Statement I is true, Statement II is false.D. Statement I is false, Statement II is true. |
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Answer» Correct Answer - A |
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| 68. |
Assertion: `Ce^(4+)` is used as an oxidising agent in volumetric analysis. Reason: `Ce^(4+)` has the tendency to attain `+3` oxidation state.A. Statement I is true, Statement II is true, Statement II is a correct explanation of Statement I.B. Statement I is true, Statement II is true, Statement II is not the correct explanation of statement IC. Statement I is true, Statement II is false.D. Statement I is false, Statement II is true. |
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Answer» Correct Answer - A |
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| 69. |
The outer electronic configuration of Gd (At.No. 64) isA. `4f^(3)5d^(3)6s^(2)`B. `4f^(8)5d^(0)6s^(2)`C. `4f^(4)5d^(4)6s^(2)`D. `4f^(7)5d^(1)6s^(2)` |
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Answer» Correct Answer - D |
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| 70. |
In context of the lanthanoids, which of the following statements is not correct?A. There is a gradual decrease in the radii of the members with increasing atomic number in the seriesB. All the member exhibit + 3 oxidation stateC. because of milar properties the separation of lanthanoids is not easyD. Availability of 4f electrons results in the formation of compounds in + 4 state for all the members of the series. |
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Answer» Correct Answer - D |
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| 71. |
The actinoids exhibit more number of oxidation states in general than the lanthanoids. This is becauseA. the 5f orbitals are more buried than the 4f orbitalsB. there is a similarity between 4f and 5f orbitals in their angular part of the wave functionC. actions are more reactive than lanthanoidsD. the 5 f orbitals extend farther from the nucleus than the 4 f orbitals |
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Answer» Correct Answer - D |
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| 72. |
Choose the correct statement (s) about electronic configuration of lanthanides:A. all the tripositive ions of the series are of the form `4f^(n)` (n=1 to 14 with increasing atomic number)B. E.C. of Gd `= [Xe] 4f^(7) 5d^(1) 6s^(2)`C. E.C. of `Gd^(2+) = [Xe] 4f^(7) 5d^(1)`D. E.C. of `Ce = [Xe] 4f^(1) 5d^(1)6s^(2)` |
| Answer» Correct Answer - A::B::C::D | |
| 73. |
Statement-1 : The third ionisation enthalpy of La, Gd and Lu are abnormally low. Statement-2 : Empty, half-filled and completelt filled orbitals of f-level are extra stable.A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explanation for Statement-1.C. Statement-1 is True, Statement-2 is falseD. Statement-1 is False and Statement-2 is True. |
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Answer» Correct Answer - A `La^(3+) rarr 4f^(0), Gd^(3+) rarr 4f^(7), Lu^(3+) rarr 4f^(14)` |
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| 74. |
In the general electronic configuration : `(n-2)f^(1-14) (n-1)d^(0-1) ns^(2)`, if the value of n = 7, then the configuration will be of :A. lanthanidesB. actinidesC. transition elementsD. none of these |
| Answer» Correct Answer - B | |
| 75. |
In context of the lanthanoids, which of the following statements is not correct?A. There is a gradual decrease in the radii of the members with increasing atomic number in the series.B. All the member exhibit + 3 oxidation stateC. because of milar properties the separation of lanthanoids is not easy.D. Availability of 4f electrons results in the formation of compounds in + 4 state for all the members of the series. |
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Answer» Correct Answer - D |
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| 76. |
In context of the lanthanoids, which of the following statements is not correct?A. Because of similar properties the separation of lanthanoids is not easyB. Availability of 4f electrons results in the formation of compounds in +4 state for all the members of the seriesC. There is a gradual decrease in the radii of the members with increasing atomic number in the seriesD. All the members exhibit +3 oxidation state |
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Answer» Correct Answer - B Common oxidation state is +3. |
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| 77. |
In which of the following Lanthanoids oxidation state + 2 is most stable ?A. CeB. EuC. TbD. Dy |
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Answer» Correct Answer - B |
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| 78. |
Which of the following forms stable +4 oxidation state ?A. La (Z = 57)B. Eu (Z = 63)C. Gd (Z = 64)D. Ce (Z = 58) |
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Answer» Correct Answer - D `Ce^(4+)` exists in solutions. |
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| 79. |
The first f-block organometallic compound `[ThH(OR)(C_(5)Me_(5))_(2)]` was prepared in late 1970s. Find the oxidation state of central metal atom/cation. |
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Answer» Correct Answer - 4 `[Th overset(-1)(H)overset(-1)((OR))(C_(6)overset(-2)(Me_(5)))_(2)]` |
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| 80. |
The lanthanide contraction is responsible for the fact thatA. Zr and Y have about the same radiusB. Zr and Nb have similar oxidation stateC. Zr and Hf have about the same radiusD. Zr and Zn have similar oxidation state |
| Answer» Correct Answer - C | |
| 81. |
Statement-1 : Colour of lanthanide ions are pale in nature. Statement-2 : In the f-f transition change in subsidiary quantum number is zero.A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explanation for Statement-1.C. Statement-1 is True, Statement-2 is falseD. Statement-1 is False and Statement-2 is True. |
| Answer» Correct Answer - A | |
| 82. |
Arrange `Ce^(3+),La^(3+), Pm^(3)` and `Yb^(3+)` in increasing order of their size -A. `Yb^(3+)lt "Pm"^(3+)lt Ce^(3+)lt La^(3+)`B. `Ce^(3+)lt Yb^(3+)lt "Pm"^(3+)lt La^(3+)`C. `Yb^(3+)lt "Pm"^(3+)lt La^(3+)lt Ce^(3+)`D. `"Pm"^(3+)lt La^(3+)lt Ce^(3+)lt Yb^(3+)` |
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Answer» Correct Answer - A |
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| 83. |
Choose the correct statement for antinides.A. Pa, U, Np, Pu and Cm have very sharp lines in the absorption spectra.B. Spectral lines are ten times as intense as those from the lanthanides.C. `Am^(2+)` exists only in the solid as the fluoride.D. `Cf^(2+), Es^(2+), Fm^(2+), Md^(2+)` and `No^(2+)` exist as ions in solution. |
| Answer» Correct Answer - A::B::C::D | |
| 84. |
Which of the following pairs has the same size ?A. `Zn^(2+), Hf^(4+)`B. `Fe^(2+), Ni^(2+)`C. `Zr^(4+), Ti^(4+)`D. `Zr^(4+), Hf^(4+)` |
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Answer» Correct Answer - D Due to lanthanide contraction. |
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| 85. |
Select the correct statement(s) regarding chemical reactions of Ln:A. The carbides `Ln_(3)C, Ln_(2)C_(3)` and `LnC_(2)` are formed when the metals are heated with carbon.B. They liberate hydrogen from dilute acids and burn in halogens to form halides.C. They form oxides `M_(2)O_(3)` and hydroxides `M(OH)_(3)`.D. The hydroxides are just hydrated oxides and not definite compounds. |
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Answer» Correct Answer - A::B::C Hydroxides are definite compounds, not just hydrated oxides. |
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| 86. |
Statement - I :- `La^(3+), Lu^(3+)` ions are colourless Statement - II :- They do not contain unpaired electronsA. Statement I is true, Statement II is true, Statement II is a correct explanation of Statement I.B. Statement I is true, Statement II is true, Statement II is not the correct explanation of statement IC. Statement I is true, Statement II is false.D. Statement I is false, Statement II is true. |
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Answer» Correct Answer - A |
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| 87. |
The radius of `La^(3+)(Z=57)` is 106 pm. Which one of the following given values will be closest to the radius of `Lu^(3+)(Z=71)`?A. `1.6 Å`B. `1.4 Å`C. `1.06 Å`D. `0.85 Å` |
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Answer» Correct Answer - D As `Z uarr`, size `darr` |
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