The d- and f-Block Elements Chapter-Wise Test 9

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about actinoids is correct?

Actinoids exhibit variable oxidation states due to comparable energies of 5f, 6d, and 7s orbitals.

They show only +3 oxidation state
They are non-radioactive
They exhibit variable oxidation states
They do not form complexes
3

Which of the following transition metal ions has the electronic configuration [Ar] 3d8?

Ni2+ (Z=28) loses two 4s electrons, resulting in [Ar] 3d8 configuration.

Fe2+
Co2+
Ni2+
Cu2+
3

Which of the following is NOT a use of potassium permanganate?

KMnO4 is used as an oxidant, disinfectant, and in organic synthesis, but not as a reducing agent.

Oxidizing agent in organic chemistry
Disinfectant
Reducing agent in metallurgy
Bleaching agent
3

Which lanthanoid exhibits +4 oxidation state due to its noble gas-like configuration?

Cerium (Ce) shows +4 state to achieve stable 4f0 configuration (like Xenon).

La
Ce
Gd
Lu
2

Which of the following is a strong oxidizing agent?

KMnO4 (Mn in +7 state) readily accepts electrons, making it a strong oxidant.

FeSO4
CrCl3
CuSO4
KMnO4
4

Which of the following transition metal ions has the electronic configuration [Ar] 3d4?

Cr2+ (Z=24) loses two 4s electrons, resulting in [Ar] 3d4 configuration.

Mn3+
Cr2+
Fe3+
Co2+
2

What is the shape of the MnO4- ion?

Permanganate ion (MnO4-) has tetrahedral geometry with sp3 hybridization.

Square planar
Tetrahedral
Octahedral
Linear
2

Which of the following is used as a catalyst in the Haber process?

Finely divided iron (Fe) catalyzes the reaction: N2 + 3H2 → 2NH3.

V2O5
Fe
Ni
Pt
2

Which of the following lanthanoids shows +4 oxidation state?

Cerium (Ce) exhibits +4 oxidation state due to the stability of empty 4f orbitals (4f0).

La
Ce
Gd
Lu
2

Which of the following is NOT a use of potassium dichromate?

K2Cr2O7 is an oxidizing agent, not used as a reducing agent.

Oxidizing agent in organic chemistry
Primary standard in volumetric analysis
Reducing agent in metallurgy
Leather tanning
3

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