The d- and f-Block Elements Chapter-Wise Test 12

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is NOT a characteristic of transition metal complexes?

Transition metal complexes are typically colored due to d-d transitions.

Formation of coordinate bonds
Variable coordination numbers
Colorless nature
Paramagnetism
1

What is the shape of the Cr2O72− ion?

Dichromate ion consists of two tetrahedral CrO4 units sharing one oxygen atom (Cr–O–Cr bond angle: 126°).

Linear
Tetrahedral
Two tetrahedra sharing a corner
Octahedral
3

Which of the following is NOT a property of transition metals?

Transition metals form interstitial compounds, not intermetallic compounds (alloys are different).

Formation of colored ions
Catalytic activity
Formation of intermetallic compounds
Paramagnetism
3

Which of the following statements about interstitial compounds is correct?

Interstitial compounds are formed when small atoms occupy voids in metal crystal lattices.

They are typically ionic
They have low melting points
Small atoms occupy metal lattice voids
They are poor conductors
3

Which of the following transition metals has the highest enthalpy of atomization?

Tungsten (W) has the highest enthalpy of atomization in the 5d series due to strong metallic bonding.

Cr
W
Fe
Ni
3

What happens when KMnO4 is heated strongly?

2KMnO4 → K2MnO4 + MnO2 + O2 (thermal decomposition at ~513K).

Forms K2MnO4 and O2
Forms Mn2O7
No reaction
Forms Mn metal
2

Which of the following is NOT a property of transition metal complexes?

Transition metal complexes are typically colored due to d-d transitions.

Formation of coordinate bonds
Variable coordination numbers
Colorless nature
Paramagnetism
3

Which of the following lanthanoids shows +2 oxidation state due to f14 configuration?

Yb2+ has f14 configuration which is stable due to completely filled f-orbitals.

Ce
Eu
Yb
Gd
3

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 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

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