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  4. d- and f-Block Elements Chapter-Wise Test 3

d- and f-Block Elements Chapter-Wise Test 3

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which lanthanoid exhibits +2 oxidation state due to f7 configuration?

Eu2+ (Europium) has a stable half-filled f7 configuration.

Ce
Eu
Gd
Lu
2

Which of the following statements about actinoids is INCORRECT?

Actinoids are all radioactive, contrary to the incorrect option.

They exhibit variable oxidation states
They are all radioactive
They form colored ions
They are non-radioactive
4

Which of the following ions is diamagnetic?

Cu+ has 3d10 configuration with all paired electrons, making it diamagnetic.

Fe3+
Cr3+
Cu+
Mn2+
3

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] 3d7?

Co2+ (Z=27) loses two 4s electrons, resulting in [Ar] 3d7 configuration.

Fe2+
Co2+
Ni2+
Cu2+
2

Which of the following is NOT a use of transition metals or their compounds?

Transition metals are not used as inert electrodes - Pt is used but it's not inert.

Catalysts
Pigments
Inert electrodes
Alloy formation
3

What is the magnetic moment (in BM) of a transition metal ion with 3 unpaired electrons?

Using the spin-only formula: μ = √[n(n+2)] = √[3(3+2)] = √15 ≈ 3.87 BM

2.83
3.87
4.90
5.92
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

What is the product when acidified KMnO4 reacts with Fe2+?

MnO4– oxidizes Fe2+ to Fe3+ and itself reduces to Mn2+.

Fe3+ + Mn2+
Fe + MnO2
Fe3+ + MnO2
Fe + Mn2+
1

Which of the following is NOT an interstitial compound?

Interstitial compounds are formed by small atoms (H, C, N) occupying voids in metal lattices. KMnO4 is an ionic compound.

TiH1.7
Fe3H
KMnO4
Mn4N
3

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