The d and f Block Elements Practice Questions

Class 12 · Chemistry · 2760 free MCQs with instant results and detailed explanations.

2760

Total

839

Easy

1358

Medium

563

Hard

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Topics in The d and f Block Elements

Interstitial Compounds 705

Actinoids 682

Lanthanoids 696

Transition Elements 677

Sample Questions from The d and f Block Elements

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Easy

Which of the following elements is known for its ability to form colored complexes due to d-d transitions?

A. Copper (Cu)

B. Calcium (Ca)

C. Sodium (Na)

D. Magnesium (Mg)

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Correct Answer: A

Copper forms colored complexes due to the presence of unpaired d-electrons that allow d-d transitions when light is absorbed.

Easy

What is the oxidation state of Chromium in the compound K2Cr2O7?

A. +6

B. +3

C. +2

D. +4

Show Answer & Explanation

Correct Answer: A

In K2Cr2O7, the oxidation state of chromium is +6, calculated using the overall charge balancing of the compound.

Easy

Which property is NOT characteristic of transition metals?

A. Formation of colored compounds

B. High melting and boiling points

C. Formation of covalent bonds

D. Formation of only ionic compounds

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Correct Answer: D

Transition metals can form both ionic and covalent bonds; thus, the statement about only forming ionic compounds is incorrect.

Medium

Which of the following transition metals has the highest melting point?

A. Tungsten

B. Iron

C. Nickel

D. Copper

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Correct Answer: A

Tungsten has the highest melting point among transition metals, reaching 3422°C due to strong metallic bonding.

Medium

Which of the following transition metals exhibits a +7 oxidation state?

A. Manganese

B. Iron

C. Copper

D. Zinc

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Correct Answer: A

Manganese can exhibit a +7 oxidation state, notably in permanganate ion (MnO4-).

Medium

Which of the following compounds of transition metals is colored due to d-d transitions?

A. NaCl

B. CuSO4

C. CaCO3

D. H2O

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Correct Answer: B

CuSO4 is blue in color due to d-d transitions of Cu2+ ions in an octahedral field.

Medium

The ligand that can act as both a Lewis acid and a Lewis base is known as?

A. Monodentate

B. Bidentate

C. Ambidentate

D. Polydentate

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Correct Answer: C

Ambidentate ligands can coordinate through different atoms, potentially acting as either a Lewis acid or base.

Hard

Which of the following transition elements has the highest melting point?

A. Tungsten

B. Iron

C. Vanadium

D. Chromium

Show Answer & Explanation

Correct Answer: A

Tungsten has the highest melting point among all transition metals due to its strong metallic bonding and high atomic mass.

Hard

Which of the following ions is colored due to d-d transitions?

A. Fe^{2+}

B. Zn^{2+}

C. Ca^{2+}

D. Ba^{2+}

Show Answer & Explanation

Correct Answer: A

Fe^{2+} has unpaired electrons in its d-orbitals, allowing for d-d transitions, which are responsible for coloring.

Q10

Hard

The oxidation state of manganese in permanganate ion (MnO4^{-}) is:

A. 7

B. 4

C. 2

D. 6

Show Answer & Explanation

Correct Answer: A

In MnO4^{-}, the oxidation state of Mn can be calculated as +7 to balance the -8 from four oxygen atoms.

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The d and f Block Elements — Class 12 Chemistry Practice Questions Online

This page contains 2760 practice MCQs for the chapter The d and f Block Elements in Class 12 Chemistry. The questions are organized by difficulty — 839 easy, 1358 medium, 563 hard — so you can choose the right level for your preparation.

Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 4 topics, giving you comprehensive coverage of the entire chapter.