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  1. Problems
  2. /The d- and f-Block Elements

The d- and f-Block Elements

Chemistry

Transition elements and their trends, dichromate and permanganate, lanthanoids and actinoids.

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33 problems
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1.
Americium has the configuration [Rn] 5f⁷ 7s² and its highest known oxidation state is +6… New
High School (11–12) · Lanthanoids and Actinoids (f-Block)A-Level, IB, NEETStemPy LabStemPy Lab
Hard
2.
A smoke detector holds 0.52 mg of americium-241, with a half-life of 432 years… New
High School (11–12) · Lanthanoids and Actinoids (f-Block)StemPy LabStemPy Lab
Medium
3.
A nucleus of uranium-238 (atomic number 92) absorbs a neutron… New
High School (11–12) · Lanthanoids and Actinoids (f-Block)A-Level, IB, NEETStemPy LabStemPy Lab
Medium
4.
The ion Y³⁺ has a radius of 90.0 pm. The radii of the 3+ ions of the heavy lanthanoids are: Gd… New
High School (11–12) · Lanthanoids and Actinoids (f-Block)StemPy LabStemPy Lab
Hard
5.
The radius of Sm³⁺ is 95.8 pm and that of Yb³⁺ is 86.8 pm… New
High School (11–12) · Lanthanoids and Actinoids (f-Block)A-Level, IB, NEETStemPy LabStemPy Lab
Medium
6.
Zirconium has a density of 6.51 g/cm³, a molar mass of 91.2 g/mol and an atomic radius of 160 pm… New
High School (11–12) · Lanthanoids and Actinoids (f-Block)A-Level, IB, NEETStemPy LabStemPy Lab
Medium
7.
The effective charge on the 5s and 5p electrons of La³⁺ is 11.25, and the radius of La³⁺ is 103.2… New
High School (11–12) · Lanthanoids and Actinoids (f-Block)A-Level, IB, NEETStemPy LabStemPy Lab
Medium
8.
Dysprosium has atomic number 66. Find the number of 4f electrons in Dy³⁺ and in Dy⁴⁺, and the… New
High School (11–12) · Lanthanoids and Actinoids (f-Block)A-Level, IB, NEETStemPy LabStemPy Lab
Hard
9.
A 25.00 mL sample of an iron(II) solution is titrated with ceric ammonium sulfate, 0.0500 mol/L… New
High School (11–12) · Lanthanoids and Actinoids (f-Block)StemPy LabStemPy Lab
Medium
10.
The standard potentials of two couples are E°(Sm³⁺/Sm²⁺) = -1.55 V and E°(Yb³⁺/Yb²⁺) = -1.05 V… New
High School (11–12) · Lanthanoids and Actinoids (f-Block)A-Level, IB, NEETStemPy LabStemPy Lab
Medium
11.
Terbium has atomic number 65. It forms a 3+ ion and also a 4+ ion… New
High School (11–12) · Lanthanoids and Actinoids (f-Block)A-Level, IBStemPy LabStemPy Lab
Easy
12.
The atomic radii are 126 pm for iron, 129 pm for chromium and 175 pm for lead… New
High School (11–12) · Transition Elements (d-Block)StemPy LabStemPy Lab
Medium
13.
A brass is 64.0 % copper by mass, and the rest is zinc… New
High School (11–12) · Transition Elements (d-Block)A-Level, IBStemPy LabStemPy Lab
Easy
14.
Sulfur dioxide, 160 g with a molar mass of 64.0 g/mol, passes over vanadium(V) oxide, and 90.0 % of… New
High School (11–12) · Transition Elements (d-Block)StemPy LabStemPy Lab
Medium
15.
Hot, acidified potassium permanganate oxidises toluene to benzoic acid: 5C₆H₅CH₃ + 6MnO₄⁻ + 18H⁺ →… New
High School (11–12) · Transition Elements (d-Block)A-Level, IB, JEE MainStemPy LabStemPy Lab
Hard
16.
A 1.50 g sample of sodium nitrite, NaNO₂, is dissolved and made up to 250 mL… New
High School (11–12) · Transition Elements (d-Block)A-Level, IB, JEE MainStemPy LabStemPy Lab
Medium
17.
A solution holds 0.0600 mol of potassium manganate… New
High School (11–12) · Transition Elements (d-Block)A-Level, IB, JEE MainStemPy LabStemPy Lab
Medium
18.
A 7.90 g sample of pure potassium permanganate, with a molar mass of 158 g/mol, is heated until it… New
High School (11–12) · Transition Elements (d-Block)A-Level, IBStemPy LabStemPy Lab
Easy
19.
A student weighs 0.1470 g of pure potassium dichromate, with a molar mass of 294 g/mol… New
High School (11–12) · Transition Elements (d-Block)StemPy LabStemPy Lab
Medium
20.
A 25.0 mL sample of 0.0800 mol/L sodium chromate solution is acidified with 0.100 mol/L sulfuric… New
High School (11–12) · Transition Elements (d-Block)A-Level, IBStemPy LabStemPy Lab
Easy
21.
A works wants 1.47 kg of potassium dichromate, K₂Cr₂O₇, which has a molar mass of 294 g/mol… New
High School (11–12) · Transition Elements (d-Block)A-Level, IB, JEE MainStemPy LabStemPy Lab
Medium
22.
Chromite ore is roasted with sodium carbonate and air: FeCr₂O₄ + Na₂CO₃ + O₂ → Na₂CrO₄ + Fe₂O₃ +… New
High School (11–12) · Transition Elements (d-Block)StemPy LabStemPy Lab
Medium
23.
A solution absorbs light of wavelength 620 nm… New
High School (11–12) · Transition Elements (d-Block)A-Level, Board Exam, IBStemPy LabStemPy Lab
Medium
24.
E°(Cu⁺/Cu) = +0.52 V and E°(Cu²⁺/Cu⁺) = +0.16 V… New
High School (11–12) · Transition Elements (d-Block)StemPy LabStemPy Lab
Hard
25.
Find the spin-only magnetic moment of Cr³⁺ (Z = 24), Fe²⁺ (Z = 26) and Ni²⁺ (Z = 28), in BM. New
High School (11–12) · Transition Elements (d-Block)A-Level, Board Exam, IBStemPy LabStemPy Lab
Medium
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