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Important Questions

d- and f-Block Elements

ICSE · Class 12 · Chemistry

Most important questions from d- and f-Block Elements for ICSE Class 12 Chemistry board exam 2026. MCQs, short answer, and long answer questions with marks.

60 questions45 flashcards5 concepts

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An infographic showing the trend in the nature of oxides (basic, amphoteric, acidic, neutral) across a period in the periodic table, with examples.
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60 Questions·
multiple choicetrue false

Sample Questions

1multiple choice
1 marks

The colour of CuSO₄ solution is:

Show answer

Blue

CuSO₄ solution is blue because Cu²⁺ (3d⁹) has one unpaired electron and one d-orbital vacancy. The d-d transition absorbs orange-red light, and the complementary colour (blue) is observed.

2true false
1 marks

All d-block elements are transition elements.

Show answer

False

Zn, Cd, and Hg are d-block elements but are NOT transition elements because they have completely filled d¹⁰ orbitals in their ground state and in all their stable ions. Transition elements require incomplete d-orbitals in atom or ion.

3multiple choice
1 marks

Magnetic moment of an ion with 3 unpaired electrons is:

Show answer

√15 BM

μ = √(n(n+2)) BM. For n=3: μ = √(3×5) = √15 ≈ 3.87 BM. This corresponds to ions like Cr³⁺ (3d³).

4multiple choice
1 marks

Which of the following is used as a catalyst in the Haber process for synthesis of ammonia?

Show answer

Iron (Fe)

Iron is the catalyst in the Haber-Bosch process: N₂ + 3H₂ ⇌ 2NH₃ (450°C, 200 atm). Molybdenum (Mo) is used as a promoter. V₂O₅ is for the Contact process; Pt is for the Ostwald process.

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Frequently Asked Questions

What are the important topics in d- and f-Block Elements for ICSE Class 12 Chemistry?
Key topics in d- and f-Block Elements include d- and f-Block Elements — Complete Concept Map, Electronic Configuration Exceptions in 3d Series, Is an Element a True Transition Metal?. These are the concepts ICSE Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in d- and f-Block Elements — ICSE Class 12 Chemistry?
Understand the core concepts first, then work through the 60 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many important questions are there in d- and f-Block Elements?
There are 60 practice questions available for d- and f-Block Elements. These cover multiple question types including MCQs, short answer, and long answer questions.

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