Which of the following is NOT a physical or chemical characteristic of interstitial compounds?

They are very soft and ionic in nature.

They have high melting points, higher than those of pure metals.

They retain metallic conductivity.

They are chemically inert and usually non-stoichiometric.

Given below are two statements : Statement I : The first ionization enthalpy of Cr is lower than that of Mn . Statement II : The second and third ionization enthalpies of Cr are higher than those of Mn . In the light of the above statements, choose the correct answer from the options given below :

Statement I is true but Statement II is false

Both Statement I and Statement II are true

Both Statement I and Statement II are false

Statement I is false but Statement II is true

Given below are two statements for catalytic properties of transition metals. Statement I : First row transition metals which act as catalyst utilise their 3d electrons only for formation of bonds between reactant molecules and atoms on the surface of catalyst. Statement II : There is increase in the concentration of reactants on the surface of catalyst which strengthens the bonds in reacting molecules. In the light of the above statements, choose the correct answer from the options given below :

Both Statement I and Statement II are incorrect

Both Statement I and Statement II are correct

Statement I is correct but Statement II is incorrect

Statement I is incorrect but Statement II is correct

Pair of transition metal ions having the same number of unpaired electrons is

$\mathrm{V}^{2+}, \mathrm{Co}^{2+}$

$\mathrm{Ti}^{3+}, \mathrm{Mn}^{2+}$

$\mathrm{Ti}^{2+}, \mathrm{Co}^{2+}$

$\mathrm{Fe}^{3+}, \mathrm{Cr}^{2+}$

D And F Block Elements — JEE Main Previous Year Questions

205 solved PYQs · 2016–2026 · Chemistry

Solved PYQs: 205
Years covered: 2016–2026
Avg / year: ~19
Subject: Chemistry

How many JEE Main questions come from D And F Block Elements?

D And F Block Elements has contributed 205 questions to Joint Entrance Examination (Main) papers between 2016 and 2026 — an average of about 19 questions a year. That count is measured from EByAi’s bank of 55,289 JEE Main questions, not estimated from a syllabus. Every one of the 205 questions carries a written, step-by-step solution, and each is tagged to D And F Block Elements within Chemistry, so you can drill this chapter across every year at once instead of hunting through paper PDFs. Practising a chapter’s full PYQ history is the fastest way to learn the patterns examiners reuse.

Sample D And F Block Elements questions from real JEE Main papers

These are 5 real questions from the bank — exactly as asked, with the answer one tap away. All 205 D And F Block Elements questions (with full written solutions) are available in practice.

Question 1 · JEE Main 2026
Which of the following is NOT a physical or chemical characteristic of interstitial compounds?
1. (A) $They have high melting points, higher than those of pure metals.$
2. (B) $They are very soft and ionic in nature.$
3. (C) $They retain metallic conductivity.$
4. (D) $They are chemically inert and usually non-stoichiometric.$
Show answerAnswer
$Answer: (B) They are very soft and ionic in nature.$
Question 2 · JEE Main 2026
Pairs of elements with the same number of electrons in their respective 4f orbital are [Atomic number. Eu-63, Gd-64, Dy-66, Ho-67, Tm-69, Yb-70, Lu-71, Hf-72] A. (Eu and Gd) B. (Dy and Ho) C. ( Yb and Hf ) D. ( Lu and Tm) Choose the correct answer from the options given below :
1. (A) $B and C Only$
2. (B) $A and B Only$
3. (C) $A and D Only$
4. (D) $A and C Only$
Show answerAnswer
$Answer: (D) A and C Only$
Question 3 · JEE Main 2026
Given below are two statements : Statement I : The first ionization enthalpy of Cr is lower than that of Mn . Statement II : The second and third ionization enthalpies of Cr are higher than those of Mn . In the light of the above statements, choose the correct answer from the options given below :
1. (A) $Statement I is true but Statement II is false$
2. (B) $Both Statement I and Statement II are true$
3. (C) $Both Statement I and Statement II are false$
4. (D) $Statement I is false but Statement II is true$
Show answerAnswer
$Answer: (A) Statement I is true but Statement II is false$
Question 4 · JEE Main 2026
Given below are two statements for catalytic properties of transition metals. Statement I : First row transition metals which act as catalyst utilise their 3d electrons only for formation of bonds between reactant molecules and atoms on the surface of catalyst. Statement II : There is increase in the concentration of reactants on the surface of catalyst which strengthens the bonds in reacting molecules. In the light of the above statements, choose the correct answer from the options given below :
1. (A) $Both Statement I and Statement II are correct$
2. (B) $Both Statement I and Statement II are incorrect$
3. (C) $Statement I is correct but Statement II is incorrect$
4. (D) $Statement I is incorrect but Statement II is correct$
Show answerAnswer
$Answer: (B) Both Statement I and Statement II are incorrect$
Question 5 · JEE Main 2025
Pair of transition metal ions having the same number of unpaired electrons is
1. (A) $Ti^{3 +}, Mn^{2 +}$
2. (B) $Ti^{2 +}, Co^{2 +}$
3. (C) $Fe^{3 +}, Cr^{2 +}$
4. (D) $V^{2 +}, Co^{2 +}$
Show answerAnswer
$Answer: (D) V^{2 +}, Co^{2 +}$

D And F Block Elements questions by year

Year	Questions	Share of chapter questions
2026	21
2025	19
2024	34
2023	30
2022	30
2021	36
2020	12
2019	14
2018	2
2017	3
2016	4

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FAQs

How many JEE Main questions have been asked from D And F Block Elements?

EByAi's bank holds 205 real JEE Main questions from D And F Block Elements, asked between 2016 and 2026 — about 19 per year on average. Every count is measured from actual papers, not estimated.

Is D And F Block Elements important for JEE Main?

205 questions over 11 papers make D And F Block Elements a high-weightage chapter in JEE Main Chemistry. The year-wise table above shows exactly how often it appears.

Can I solve D And F Block Elements PYQs online for free?

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