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Important Questions

The d-and f-Block Elements

Assam Board · Class 12 · Chemistry

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

90 questions20 flashcards5 concepts

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A flowchart detailing the industrial preparation of potassium dichromate, starting from chromite ore and involving fusion, acidification, and conversion steps.
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90 Questions·
multiple choicemultiple correctshort answer

Sample Questions

1multiple correct

Which of the following are characteristic properties of transition elements? (Select all correct answers)

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Formation of colored compounds, Variable oxidation states, Catalytic properties, Paramagnetism

Transition elements show colored compounds due to d-d transitions, variable oxidation states due to similar energies of ns and (n-1)d orbitals, catalytic properties due to multiple oxidation states, and paramagnetism due to unpaired electrons. They are not highly reactive with water like alkali metals.

2multiple correct

Which of the following compounds are used as oxidizing agents? (Select all correct answers)

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K₂Cr₂O₇ (Potassium dichromate), KMnO₄ (Potassium permanganate)

K₂Cr₂O₇ and KMnO₄ are strong oxidizing agents because they contain metals (Cr and Mn) in high oxidation states (+6 and +7 respectively) that can be easily reduced. FeSO₄ and CuSO₄ are not typically used as oxidizing agents.

3multiple choice

The magnetic moment of an ion with 3 unpaired electrons is approximately:

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3.87 BM

The magnetic moment is calculated using the spin-only formula: μ = √[n(n+2)] BM, where n is the number of unpaired electrons. For n=3: μ = √[3(3+2)] = √15 = 3.87 BM.

4multiple choice

Which series of elements constitutes the f-block?

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Lanthanoids and actinoids

The f-block consists of lanthanoids (4f series, Ce to Lu) and actinoids (5f series, Th to Lr). These elements have partially filled f-orbitals and are also called inner transition elements.

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Frequently Asked Questions

What are the important topics in The d-and f-Block Elements for Assam Board Class 12 Chemistry?
Key topics in The d-and f-Block Elements include Complete Concept Map: d- and f-Block Elements, Overview of d-Block Transition Elements — Key Characteristics, Is It a Transition Metal? — Decision Flowchart. These are the concepts Assam Board Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in The d-and f-Block Elements — Assam Board Class 12 Chemistry?
Understand the core concepts first, then work through the 90 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 The d-and f-Block Elements?
There are 90 practice questions available for The d-and f-Block Elements. These cover multiple question types including MCQs, short answer, and long answer questions.

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Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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