The d- and f-Block Elements Chapter-Wise Test 11

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is used as a catalyst in the oxidation of NH3 to NO?

Pt-Rh gauze is used as a catalyst in the Ostwald process for NH3 oxidation.

V2O5
Pt-Rh
Fe
Ni
2

Which of the following is NOT true about interstitial compounds?

Interstitial compounds have high melting points, not low melting points.

They are very hard
They have low melting points
They retain metallic conductivity
They are chemically inert
2

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

Which of the following exhibits the highest oxidation state in its compounds?

Mn shows up to +7 oxidation state (e.g., KMnO4), the highest in the 3d series.

Fe
Co
Mn
Ni
3

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

What is the primary reason for the formation of interstitial compounds by transition metals?

Transition metals have voids in their crystal lattices that can accommodate small atoms like H, C, or N.

Presence of lattice voids
High electronegativity
Small atomic size
Low ionization energy
1

Which transition metal exhibits the +1 oxidation state most frequently?

Cu+ is common due to the stability of the 3d10 configuration.

Fe
Cu
Mn
Cr
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 actinoids exhibits the +6 oxidation state?

Uranium (U) shows +6 oxidation state in compounds like UF6 and UO22+.

Thorium (Th)
Uranium (U)
Plutonium (Pu)
Actinium (Ac)
2

What is the reason for the higher melting points of transition metals compared to s-block metals?

Strong metallic bonding due to involvement of d-electrons in bonding.

Smaller atomic size
Involvement of d-electrons in bonding
Lower ionization energy
Presence of f-electrons
2

Performance Summary

Score:

Category Details
Total Attempts:
Total Skipped:
Total Wrong Answers:
Total Correct Answers:
Time Taken:
Average Time Taken per Question:
Accuracy:
0