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Important Questions

Chemistry

D And F Block Elements

D- And F- Block Elements Important Questions for NEET Chemistry - 2026

Q: 1. What are the most important NEET questions from the D- and F- Block Elements chapter?

Questions often focus on electronic configuration patterns, oxidation states, trends in properties (such as colour and magnetism), and preparation/use of K2Cr2O7 and KMnO4. Focus on MCQs, assertion-reason, and numericals, especially predicting properties based on trends.

Q: 2. What types of MCQs are commonly asked from transition elements in NEET exams?

MCQs test trends like atomic radii, colour, oxidation states, and magnetic properties. You might see questions about identifying d-block series, order of ionization enthalpy, or matching transition metal properties. Practice with chapter-wise MCQs for revision.

Q: 3. Which topics from the preparation and uses of K₂Cr₂O₇ and KMnO₄ are most expected in NEET?

Focus on chemical equations, oxidation reactions, and practical uses. NEET often asks:Steps in the preparation methodsBalanced equationsReason for strong oxidising behaviourApplications in industry or lab

Q: 4. How do NEET assertion-reason questions test D- and F- block elements?

Assertion-reason types check if you understand key concepts and cause-effect relationships. Typical questions include: why certain ions show colour, variable oxidation states, or high catalytic activity in transition elements. Always read both statements carefully and match with theory from the chapter.

Q: 5. What are common pitfalls students should avoid while solving important questions from lanthanoids and actinoids?

Avoid confusing electronic configurations and oxidation states. Watch out for simple traps like:Incorrect placement of 4f and 5f electronsMisidentifying causes of the lanthanoid contractionMixing up common ionsAlways double-check trends and exceptions in periodic table behavior.

Q: 6. How should I prepare for match-the-following and statement-based questions in D- and F- block elements?

These questions target properties, oxidation states, and uses. Tips include:Make short notes and flashcardsRevise exceptions and key trendsPractice matching tables and assertion-reason sets regularly

Q: 7. Are numericals and diagram-based questions relevant for the D- and F- block elements NEET chapter?

Numericals appear less frequently, but some short calculation questions can come—especially on mole concept, oxidation state determination, or titration equations. Diagrams include electronic configuration or crystal field splitting, so review simple visual representations as part of your practice.

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Practice D- And F- Block Elements Important Questions - Free PDF Download

D- and F- Block Elements is an important chapter in NEET Chemistry. This section deals with the chemistry of transition and inner transition elements. Understanding these topics is essential for answering many NEET questions.

The chapter covers electronic configuration, properties, and trends of transition elements. You will learn about ionization enthalpy, oxidation states, atomic radii, colours, catalytic behaviour, and magnetic properties. It also includes compounds like K₂Cr₂O₇ and KMnO₄, lanthanoids, and actinoids.

Practising with Vedantu’s NEET Important Questions with Answers helps clarify these topics. You get questions on every important point from this chapter. Download the free NEET Important Questions PDF to strengthen your preparation today.

Practice D- And F- Block Elements Important Questions - Free PDF Download

1. Multiple choice questions.

1. The element in the first transition series which shows the maximum number of oxidation states is:

(a) Scandium
(b) Manganese
(c) Chromium
(d) Iron

Answer: (b) Manganese.

2. The lanthanoid contraction is mainly due to:

(a) Increase in nuclear charge and poor shielding by 4f electrons
(b) Increase in atomic number
(c) Increase in mass number
(d) Poor shielding by 5d electrons

Answer: (a) Increase in nuclear charge and poor shielding by 4f electrons.

3. KMnO₄ acts as an oxidising agent in acidic medium. The oxidation state of Mn changes from:

(a) +4 to +2
(b) +7 to +2
(c) +6 to +4
(d) +6 to 0

Answer: (b) +7 to +2.

4. Which one of the following ions is coloured?

(a) Ti⁴⁺
(b) Zn²⁺
(c) Sc³⁺
(d) V²⁺

Answer: (d) V²⁺.

2. Very Short Answer (VSA).

1. Define transition elements.

Answer: Transition elements are d-block elements which have partially filled d-orbitals in their ground state or in any one of their oxidation states.

2. What is lanthanoid contraction?

Answer: Lanthanoid contraction refers to the steady decrease in ionic and atomic radii of lanthanoids with increasing atomic number.

3. Give the formula of potassium dichromate.

Answer: The chemical formula of potassium dichromate is K₂Cr₂O₇.

4. Write the most common oxidation state of actinoids.

Answer: The most common oxidation state of actinoids is +3.

3. Short Answer Questions.

1. Why do transition elements form coloured compounds?

Answer: Transition elements form coloured compounds due to d-d transitions. Partially filled d-orbitals allow the absorption of certain wavelengths of visible light, resulting in the colour observed in their compounds and complexes.

2. Explain the catalytic behaviour of transition metals with an example.

Answer: Transition metals act as good catalysts due to their ability to adopt multiple oxidation states and form complexes. For example, iron is used as a catalyst in the Haber process for ammonia synthesis because it provides a surface for reactions and can change oxidation states during the process.

3. What is the significance of potassium permanganate in volumetric analysis?

Answer: Potassium permanganate (KMnO₄) is a strong oxidising agent used as a self-indicator in redox titrations. It is widely used in the quantitative estimation of iron, oxalate, and hydrogen peroxide solutions.

4. Why is Zn²⁺ ion colourless whereas Cu²⁺ ion is coloured?

Answer: Zn²⁺ has a 3d¹⁰ configuration, meaning its d-orbitals are fully filled and no d-d transitions are possible, making it colourless. Cu²⁺ has a 3d⁹ configuration, allowing d-d transitions and thus colour.

4. True or False Questions.

1. All transition elements act as good catalysts due to their ability to change oxidation states.

Answer: True.

2. The electronic configuration of Ce is [Xe] 4f¹ 5d¹ 6s².

Answer: False.

3. Actinoid contraction is more pronounced than lanthanoid contraction.

Answer: True.

3. Fill in the Blanks Questions.

1. The compound used as a primary standard in the estimation of Fe²⁺ ions is __________.

Answer: KMnO₄.

2. The decrease in atomic and ionic size among lanthanoids with increasing atomic number is called __________.

Answer: lanthanoid contraction.

3. The oxidation state of chromium in K₂Cr₂O₇ is __________.

Answer: +6.

Why understanding D- and F- Block Elements matters for NEET Chemistry

Strengthening your concept of D- and F- Block Elements is vital for succeeding in NEET Chemistry. This topic covers transition elements, their key properties, and popular reagents like potassium dichromate and permanganate, often featured in exams.

Learning about oxidation states, electronic configurations, and trends like lanthanoid contraction gives you an edge in problem-solving. These ideas appear frequently in NEET questions and help connect different chemistry chapters smoothly.

With Vedantu, you can clarify difficult topics such as magnetic properties and catalytic behaviour of transition elements. Carefully designed practice questions and concise explanations can make your NEET Chemistry preparation strong and worry-free.

FAQs on D- And F- Block Elements Important Questions for NEET Chemistry - 2026

1. What are the most important NEET questions from the D- and F- Block Elements chapter?

Questions often focus on electronic configuration patterns, oxidation states, trends in properties (such as colour and magnetism), and preparation/use of K₂Cr₂O₇ and KMnO₄. Focus on MCQs, assertion-reason, and numericals, especially predicting properties based on trends.

2. What types of MCQs are commonly asked from transition elements in NEET exams?

MCQs test trends like atomic radii, colour, oxidation states, and magnetic properties. You might see questions about identifying d-block series, order of ionization enthalpy, or matching transition metal properties. Practice with chapter-wise MCQs for revision.

3. Which topics from the preparation and uses of K₂Cr₂O₇ and KMnO₄ are most expected in NEET?

Focus on chemical equations, oxidation reactions, and practical uses. NEET often asks:

Steps in the preparation methods
Balanced equations
Reason for strong oxidising behaviour
Applications in industry or lab

4. How do NEET assertion-reason questions test D- and F- block elements?

Assertion-reason types check if you understand key concepts and cause-effect relationships. Typical questions include: why certain ions show colour, variable oxidation states, or high catalytic activity in transition elements. Always read both statements carefully and match with theory from the chapter.

5. What are common pitfalls students should avoid while solving important questions from lanthanoids and actinoids?

Avoid confusing electronic configurations and oxidation states. Watch out for simple traps like:

Incorrect placement of 4f and 5f electrons
Misidentifying causes of the lanthanoid contraction
Mixing up common ions

Always double-check trends and exceptions in periodic table behavior.

6. How should I prepare for match-the-following and statement-based questions in D- and F- block elements?

These questions target properties, oxidation states, and uses. Tips include:

Make short notes and flashcards
Revise exceptions and key trends
Practice matching tables and assertion-reason sets regularly

7. Are numericals and diagram-based questions relevant for the D- and F- block elements NEET chapter?

Numericals appear less frequently, but some short calculation questions can come—especially on mole concept, oxidation state determination, or titration equations. Diagrams include electronic configuration or crystal field splitting, so review simple visual representations as part of your practice.