The d- and f-Block Elements Chapter-Wise Test 4

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which ion has the highest number of unpaired electrons?

Mn2+ has 5 unpaired electrons (3d5), the maximum in the 3d series.

Fe2+
Co2+
Mn2+
Ni2+
3

Which of the following is NOT a use of lanthanoids?

Lanthanoids are not used as structural building materials due to their softness and high reactivity.

Television phosphors
Structural building material
Petroleum cracking catalysts
Lighter flints
2

What is the geometry of the [Co(NH3)6]3+ ion?

The hexaamminecobalt(III) ion has octahedral geometry with d2sp3 hybridization.

Tetrahedral
Square planar
Octahedral
Linear
3

Which catalyst is used in the Wacker process for oxidation of ethene to acetaldehyde?

PdCl2 (with CuCl2) is used as catalyst in the Wacker process.

V2O5
PdCl2
Ni
Fe
2

What is the geometry of the [Fe(CN)6]4- ion?

The hexacyanoferrate(II) ion has octahedral geometry with d2sp3 hybridization.

Tetrahedral
Square planar
Octahedral
Linear
3

Which of the following is a correct pair of colored ion and its color?

Cu2+ is blue due to d-d transitions in its 3d9 configuration.

Cu2+ – Blue
Fe3+ – Green
Ni2+ – Yellow
Zn2+ – Pink
1

Which of the following ions is colorless in aqueous solution?

Sc3+ has no unpaired electrons (3d0), so it does not exhibit d-d transitions.

Sc3+
Cu2+
Fe2+
Ni2+
1

Which actinoid exhibits the highest oxidation state of +7?

Neptunium (Np) and Plutonium (Pu) can show +7 oxidation state, though it is rare.

Thorium (Th)
Neptunium (Np)
Uranium (U)
Actinium (Ac)
2

Which transition metal ion has the electronic configuration [Ar] 3d3?

V2+ has the electronic configuration [Ar] 3d3 (neutral V is 4s23d3; loses two 4s electrons).

Fe3+
Cr3+
V2+
Mn2+
3

Which ion is diamagnetic?

Zn2+ has all paired electrons (3d10), making it diamagnetic.

Fe3+
Cr3+
Cu2+
Zn2+
4

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