The d- and f-Block Elements Chapter-Wise Test 10

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 transition metal ions has the electronic configuration [Ar] 3d7?

Co2+ (Z=27) loses two 4s electrons, resulting in [Ar] 3d7 configuration.

Fe2+
Co2+
Ni2+
Cu2+
2

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 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

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 reactions represents the oxidizing action of K2Cr2O7 in acidic medium?

Cr2O72− + 14H+ + 6e− → 2Cr3+ + 7H2O (E° = +1.33 V).

Cr2O72− → CrO42−
Cr2O72− → Cr2+
Cr2O72− → CrO2
Cr2O72− → Cr3+
4

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 is NOT an interstitial compound?

Interstitial compounds are formed by small atoms (H, C, N) occupying voids in metal lattices. KMnO4 is an ionic compound.

TiH1.7
Fe3H
KMnO4
Mn4N
3

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 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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