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  4. d- and f-Block Elements Chapter-Wise Test 2

d- and f-Block Elements Chapter-Wise Test 2

Correct answer Carries: 4.

Wrong Answer Carries: -1.

What is the primary reason for the variable oxidation states in transition elements?

Comparable energies of (n-1)d and ns orbitals allow for variable electron loss.

Small atomic size
High ionization energy
Comparable energies of (n-1)d and ns orbitals
Presence of f-electrons
3

Which of the following is NOT a characteristic of lanthanoids?

Lanthanoids are not highly volatile; they have high melting points.

Silvery-white appearance
High volatility
+3 oxidation state
Formation of colored ions
2

Which of the following represents the reaction of K2Cr2O7 with FeSO4 in acidic medium?

Cr2O72- + 6Fe2+ + 14H+ → 2Cr3+ + 6Fe3+ + 7H2O

Oxidation of Fe2+ to Fe3+
Reduction of Fe3+ to Fe2+
Formation of FeCr2O4
No reaction occurs
1

What is the product when K2Cr2O7 reacts with H2S in acidic medium?

Cr2O72– oxidizes H2S to S (yellow precipitate) and reduces to Cr3+ (green).

CrO42– + SO2
Cr2+ + H2SO4
CrO2 + H2O
Cr3+ + S
4

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 correctly represents the reduction half-reaction of dichromate ion in acidic medium?

In acidic medium, dichromate ion is reduced to Cr3+ by gaining electrons.

Cr2O72− + 14H+ + 6e− → 2Cr3+ + 7H2O
Cr2O72− → CrO42−
Cr2O72− → Cr2+
Cr2O72− → CrO2
1

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 of the following is NOT a use of lanthanoids?

Lanthanoids are used in alloys, catalysts, and phosphors, but not as primary structural materials.

Alloy steels
Petroleum cracking catalysts
Structural building material
TV screen phosphors
3

Which of the following is a consequence of lanthanoid contraction?

Lanthanoid contraction causes similar atomic radii of Zr (160 pm) and Hf (159 pm), making their separation difficult.

Increase in atomic radii across the series
Decrease in density of lanthanoids
Similar sizes of Zr and Hf
Increase in ionization energy
3

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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