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Year: 2023
Topic: The d-and f-Block Elements
1.
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R:
Assertion A : Metallic sodium dissolves in liquid ammonia giving a deep blue solution, which is paramagnetic.
Reason R: The deep blue solution is due to the formation of amide.
In the light of the above statements, choose the correct answer from the options given below:
(1).
Both A and R are true but R is NOT the correct explanation of A.
(2).
A is true but R is false.
(3).
A is false but R is true.
(4).
Both A and R are true and R is the correct explanation of A.

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Year: 2025
Topic: The d-and f-Block Elements
2.
Match List - I with List - Il

Choose the correct answer from the options given below :
(1).
A-I, B-IV, C-III, D-II
(2).
A-I, B-II, C-IV, D-III
(3).
A-II, B-III, C-I, D-IV
(4).
A-I, B-II, C-III, D-IV

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Year: 2025
Topic: The d-and f-Block Elements
3.
Given below are two statements :
Statement I : Ferromagnetism is considered as an extreme form of paramagnetism.
Statement II : The number of unpaired electrons in a \(Cr^{2+}\) ion (Z=24) is the same as that of a \(Nd^{3+}\) ion (Z= 60).
In the light of the above statements, choose the correct answer from the options given below :
(1).
Statement I is false but Statement II is true
(2).
Both Statement I and Statement II are true
(3).
Both Statement I and Statement II are false
(4).
Statement I is true but Statement II is false

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Year: 2024
Topic: The d-and f-Block Elements
4.
Given below are certain cations. Using inorganic qualitative analysis, arrange them in increasing group number from 0 to VI.
A. \(\text{Al}^{3+}\)
B. \(\text{Cu}^{2+}\)
C. \(\text{Ba}^{2+}\)
D. \(\text{Co}^{2+}\)
E. \(\text{Mg}^{2+}\)
Choose the correct answer from the options given below:
(1).
E, C, D, B, A
(2).
E, A, B, C, D
(3).
B, A, D, C, E
(4).
B, C, A, D, E

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Year: 2024
Topic: The d-and f-Block Elements
5.
Spin only' magnetic moment same for which of the following ions?
A. \(\text{Ti}^{3+}\)
B. \(\text{Cr}^{2+}\)
C. \(\text{Mn}^{2+}\)
D. \(\text{Fe}^{2+}\)
E. \(\text{Sc}^{3+}\)
Choose the most appropriate answer from the options given below:
(1).
B and C only
(2).
A and D only
(3).
B and D only
(4).
A and E only

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Year: 2024
Topic: The d-and f-Block Elements
6.
The pair of lanthanoid ions which are diamagnetic is
(1).
\(\text{Gd}^{3+}\) and \(\text{Eu}^{3+}\)
(2).
\(\text{Pm}^{3+}\) and \(\text{Sm}^{3+}\)
(3).
\(\text{Ce}^{4+}\) and \(\text{Yb}^{2+}\)
(4).
\(\text{Ce}^{3+}\) and \(\text{Eu}^{2+}\)

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Year: 2023
Topic: The d-and f-Block Elements
7.
Which amongst the following molecules on polymerization produces neoprene?
(1).
(2).
(3).
(4).

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Year: 2023
Topic: The d-and f-Block Elements
8.
Which of the following statements are INCORRECT?
A. All the transition metals except scandium form MO oxides which are ionic.
B. The highest oxidation number corresponding to the group number in transition metal oxides is attained in Sc2O3 to Mn2O7.
C. Basic character increase from V2O3 to V2O4 to V2O5.
D. V2O4 dissolves in acids to give VO43- salts.
E. CrO is basic but Cr2O3 is amphoteric.
Choose the correct answer from the options given below:
(1).
B and D only
(2).
C and D only
(3).
B and C only
(4).
A and E only

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Year: 2022
Topic: The d-and f-Block Elements
9.
Gadolinium has a low value of third ionisationenthalpy because of
(1).
small size
(2).
high exchange enthalpy
(3).
high electronegativity
(4).
high basic character

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Year: 2022
Topic: The d-and f-Block Elements
10.
In the neutral or faintly alkaline medium, KMnO4 oxidises iodide into iodate. The change in oxidation state of manganese in this reaction is from
(1).
+7 to +4
(2).
+6 to +4
(3).
+7 to +3
(4).
+6 to +5

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Year: 2021
Topic: The d-and f-Block Elements
11.
The RBC deficiency is deficiency disease of:
(1).
Vitamin B12
(2).
Vitamin B6
(3).
Vitamin B1
(4).
Vitamin B2

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Year: 2021
Topic: The d-and f-Block Elements
12.
The incorrect statement among the following is :
(1).
Actinoid contraction is greater for element to element than Lanthanoid contraction.
(2).
Most of the trivalent Lanthanoid ions are colorless in the solid state.
(3).
Lanthanoids are good conductors of heat and electricity.
(4).
Actinoids are highly reactive metals, especially when finely divided.

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Year: 2020
Topic: The d-and f-Block Elements
13.
The calculated spin only magnetic moment of Cr2+ ion is:
(1).
4.90 BM
(2).
5.92 BM
(3).
2.84 BM
(4).
3.87 BM

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Year: 2020
Topic: The d-and f-Block Elements
14.
ldentify the incorrect statement.
(1).
The transition metals and their compounds are known for their catalytic activity due to their ability to adopt multiple oxidation states and to form complexes.
(2).
Interstitial compounds are those that are formed when small atoms like H, C or N are trapped inside the crystal lattices of metals.
(3).
The oxidation states of chromium in CrO42- and Cr2O72- are not the same.
(4).
Cr2+(d4) is a stronger reducing agent than Fe2+(d6) in water.

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Year: 2019
Topic: The d-and f-Block Elements
15.
The manganate and permanganate ions are tetrahedral, due to
(1).
there is no \(\pi\) -bonding.
(2).
the \(\pi\) - bonding involves overlap of p-orbitals of oxygen with p-orbitals of manganese.
(3).
the \(\pi\) - bonding involves overlap of d-orbitals of oxygen with d-orbitals of manganese.
(4).
the \(\pi\) - bonding involves overlap of p-orbitals of oxygen with d-orbitals of manganese.

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Year: 2017
Topic: The d-and f-Block Elements
16.
It is because of inability of ns2 electrons of the valence shell to participate in bonding that
(1).
Sn4+ is reducing while Pb4+ is oxidizing.
(2).
Sn2+ is reducing while Pb4+ is oxidizing.
(3).
Sn2+ is oxidizing while 4+is reducing.
(4).
Sn2+ and Pb2+ are both oxidising and reducing.

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Year: 2017
Topic: The d-and f-Block Elements
17.
The reason for greater range of oxidation states in actinoids is attributed to
(1).
4f and 5d levels being close in energies.
(2).
the radioactive nature of actinoids.
(3).
actinoid contraction.
(4).
5f, 6d and 7s levels having comparable energies.

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Year: 2017
Topic: The d-and f-Block Elements
18.
The element Z = 114 has been discovered recently. It will belong to which of the following family group and electronic configuration ?
(1).
Nitrogen family, [Rn] 5f14 6d107s27p6
(2).
Halogen family, [Rn] 5f14 6d107s27p5
(3).
Carbon family, [Rn] 5f14 6d107s27p2
(4).
Oxygen family, [Rn] 5f14 6d107s27p4

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Year: 2016
Topic: The d-and f-Block Elements
19.
The electronic configurations of Eu (Atomic no. 63), Gd (Atomic no. 64) and Tb (Atomic no. 65) are
(1).
[Xe] 4f6 5d1 6s2, [Xe] 4f7 5d1 6s2 and [Xe] 4f9 6s2
(2).
[Xe] 4f6 5d1 6s2, [Xe] 4f7 5d1 6s2, and [Xe] 4f8 5d1 6s2
(3).
[Xe] 4f7 6s2, [Xe] 4f7 5d1 6s2 and [Xe] 4f9 6s2
(4).
[Xe] 4f7 6s2, [Xe] 4f5 6s2 and [Xe] 4f8 5d1 6s2

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Year: 2016
Topic: The d-and f-Block Elements
20.
Which of the following has longest C – O bond length ? ( Free C - O bond length in CO is 1.128 Å . )
(1).
[ Co(CO)4]-
(2).
[ Fe(CO)4]2-
(3).
[ Mn(CO)6]+
(4).
Ni(CO)4

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