The d- and f-Block Elements Chapter-Wise Test 5

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is an interstitial compound?

Interstitial compounds are formed when small atoms (H, C, N) occupy voids in metal lattices (e.g., TiC).

K2Cr2O7
CuSO4
TiC
Fe2O3
3

Which transition metal has the highest enthalpy of atomization in the 3d series?

Vanadium (V) has the highest enthalpy of atomization in the 3d series.

Cr
V
Fe
Ni
2

What is the oxidation state of Cr in K2Cr2O7?

Let oxidation state of Cr be x. 2(+1) + 2x + 7(-2) = 0 → x = +6.

+2
+4
+6
+7
3

Which of the following is NOT a transition element?

Zn has a completely filled d-orbital (3d10) in both ground and oxidized states.

Fe
Cu
Zn
Ni
3

Which actinoid is used as a nuclear fuel in thermal reactors?

Uranium-235 (U) is the primary fuel in thermal nuclear reactors.

Thorium (Th)
Uranium (U)
Plutonium (Pu)
Neptunium (Np)
2

Which of the following is true about the E° value for Cu2+/Cu (+0.34 V)?

Positive E° indicates Cu cannot displace H2 from acids, as it is less reactive than hydrogen.

Cu can displace H2 from acids
Cu is more reactive than Zn
Cu cannot displace H2 from acids
Cu oxidizes water
3

Which actinoid is used as a nuclear fuel in fast breeder reactors?

Plutonium-239 (Pu) is used as fuel in fast breeder reactors.

Thorium (Th)
Plutonium (Pu)
Uranium (U)
Neptunium (Np)
2

What is the primary reason for the catalytic activity of transition metals?

Variable oxidation states allow transition metals to form unstable intermediates.

High melting points
Variable oxidation states
Large atomic size
Presence of f-electrons
2

What is the primary reason for the similar atomic sizes of Zr and Hf?

Lanthanoid contraction compensates for the expected increase in size from Zr to Hf.

Similar atomic numbers
Lanthanoid contraction
Same number of electrons
Identical electronic configurations
2

What is the product when acidified KMnO4 reacts with oxalic acid?

2MnO4- + 5C2O42- + 16H+ → 2Mn2+ + 10CO2 + 8H2O

Mn2+ and CO2
MnO2 and CO
Mn3+ and HCOOH
MnO42- and C2H4
1

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