JEE Chemistry Classification of Elements and Periodicity in Properties MCQs Set 16

Chemistry Objective Questions and Answers: Classification Of Elements and Periodicity In Properties

Review structured MCQ sets for JEE Chemistry Classification Of Elements and Periodicity In Properties. Built according to official JEE guidelines, these downloadable questions support daily revision and core concept reinforcement.

Download Classification Of Elements and Periodicity In Properties MCQs with Answers

Access the complete set of multiple-choice questions for Classification Of Elements and Periodicity In Properties below. This focused format allows students to isolate specific topics for thorough review and uninterrupted practice alongside official JEE textbooks.

Multiple Choice Questions

Question 1: The correct order of electron gain enthalpy with negative sign of F, Cl, Br and I, having atomic number 9, 17, 35 and 53 respectively, is:
(a) I > Br > Cl > F
(b) F > Cl > Br > I
(c) Cl > F > Br > I
(d) Br > Cl > I > F
Show Answer & Explanation

Answer: (c) Cl > F > Br > I

Explanation:
1. Electron gain enthalpy (magnitude, kJ per mole): Cl 349 > F 328 > Br 325 > I 295.

Teacher's Note:
1. Break each statement into one trend at a time and test it with real values. Watch for exceptions in the p-block.
2. Revise the trend with two or three examples.

Question 2: The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy of Na⁺ will be:
(a) – 2.55 eV
(b) – 5.1 eV
(c) – 10.2 eV
(d) + 2.55 eV
Show Answer & Explanation

Answer: (b) – 5.1 eV

Explanation:
1. Na⁺ gaining an electron is the reverse of ionising Na, so it is -5.1 eV.

Teacher's Note:
1. Break each statement into one trend at a time and test it with real values. Watch for exceptions in the p-block.
2. Revise the trend with two or three examples.

Question 3: The pair of amphoteric hydroxide is:
(a) Al(OH)₃ , LiOH
(b) Be(OH)₂ , Mg(OH)₂
(c) B(OH)₃ , Be(OH)₂
(d) Be(OH)₂ , Zn(OH)₂
Show Answer & Explanation

Answer: (d) Be(OH)₂ , Zn(OH)₂

Explanation:
1. Be(OH)2 and Zn(OH)2 are amphoteric.
2. LiOH and Mg(OH)2 are basic and B(OH)3 is acidic.

Teacher's Note:
1. Break each statement into one trend at a time and test it with real values. Watch for exceptions in the p-block.
2. Revise the trend with two or three examples.

Question 4: Electronegativity is the measurement of capacity of an atom by which :
(a) Electrons get repelled
(b) Electrons get attracted
(c) Gain of electron
(d) Loose of proton
Show Answer & Explanation

Answer: (b) Electrons get attracted

Explanation:
1. Electronegativity is the power of an atom to attract the shared electron pair in a bond.

Teacher's Note:
1. Break each statement into one trend at a time and test it with real values. Watch for exceptions in the p-block.
2. Revise the trend with two or three examples.

Question 5: The ions O 2– , F —, Na⁺ , Mg 2+ and Al 3+ are isoelectronic. Their ionic radii show:
(a) an increase from O²⁻ to F⁻ and then decrease from Na⁺ to Al³⁺
(b) a decrease from O²⁻ to F⁻ and then increase from Na⁺ to Al³⁺
(c) a significant increase from O²⁻ to Al³⁺
(d) a significant decrease from O²⁻ to Al³⁺
Show Answer & Explanation

Answer: (d) a significant decrease from O²⁻ to Al³⁺

Explanation:
1. Isoelectronic ions get smaller as nuclear charge increases, so the radius falls steadily from O²⁻ to Al³⁺.

Teacher's Note:
1. Break each statement into one trend at a time and test it with real values. Watch for exceptions in the p-block.
2. Revise the trend with two or three examples.

Question 6: Ionic radii are:
(a) Directly proportional to square of effective nuclear charge
(b) Inversely proportional to effective nuclear charge
(c) Inversely proportional to square of effective nuclear charge
(d) Directly proportional to effective nuclear charge
Show Answer & Explanation

Answer: (b) Inversely proportional to effective nuclear charge

Explanation:
1. Ionic radius is inversely proportional to the effective nuclear charge.

Teacher's Note:
1. Break each statement into one trend at a time and test it with real values. Watch for exceptions in the p-block.
2. Revise the trend with two or three examples.

Question 7: Which of the following statement is correct ?
(a) Element having high I.P. have high EA also
(b) 2nd I.P. of noble gas is less than 1st I.P.
(c) I.P. of Be is more than 'B'
(d) 2nd I.P. of 'N' is more than 2nd I.P. of 'O'
Show Answer & Explanation

Answer: (c) I.P. of Be is more than 'B'

Explanation:
1. IP of Be (899) is higher than that of B (801), owing to the filled 2s.
2. The other statements are false.

Teacher's Note:
1. Break each statement into one trend at a time and test it with real values. Watch for exceptions in the p-block.
2. Revise the trend with two or three examples.

Question 8: The incorrect statement is:
(a) 2nd I.P. = Se > As
(b) 1st I.P. = C²⁺ > N²⁺
(c) 3rd I.P. = F > O
(d) Halogens have highest I.P. in respective period
Show Answer & Explanation

Answer: (d) Halogens have highest I.P. in respective period

Explanation:
1. Halogens have high IPs but noble gases have the highest in each period.
2. So the statement is incorrect.

Teacher's Note:
1. Break each statement into one trend at a time and test it with real values. Watch for exceptions in the p-block.
2. Revise the trend with two or three examples.

Question 9: Which of the following E.A. order is not correct ?
(a) N < O < S
(b) Cl > O > N > C
(c) O < S < F < Cl
(d) B < C < Si < S
Show Answer & Explanation

Answer: (b) Cl > O > N > C

Explanation:
1. N is negative or nearly zero and C is 122, so Cl > O > N > C is not correct.

Teacher's Note:
1. Break each statement into one trend at a time and test it with real values. Watch for exceptions in the p-block.
2. Revise the trend with two or three examples.

Question 10: Which one of the following order of given properties is correct ?
(a) Atomic radius - Li < Be < B
(b) Ionisation potential - Li < Be < B
(c) Electron affinity -Li < Be < B
(d) Electronegativity - Li < Be < B
Show Answer & Explanation

Answer: (d) Electronegativity - Li < Be < B

Explanation:
1. Electronegativity increases across a period: Li 1.0 < Be 1.5 < B 2.0.
2. The other trends are different.

Teacher's Note:
1. Break each statement into one trend at a time and test it with real values. Watch for exceptions in the p-block.
2. Revise the trend with two or three examples.

Question 11: The incorrect statement among the following is:
(a) Helium has the highest first I.P. in the periodic table
(b) The process O–(g) + e– → O²⁻(g) is endothermic
(c) The electron affinities of S and P are less than that O and N respectively
(d) In any period, the first ionisation potential of noble gas is the highest
Show Answer & Explanation

Answer: (c) The electron affinities of S and P are less than that O and N respectively

Explanation:
1. S has a higher EA than O and P has a higher EA than N.
2. So the statement that S and P are lower is incorrect.

Teacher's Note:
1. Break each statement into one trend at a time and test it with real values. Watch for exceptions in the p-block.
2. Revise the trend with two or three examples.

Question 12: Assertion (A): Two successive ionisation energies of Argon are 56.8 eV and 36.8 eV respectively.
Reason (R): Zeff of Ar (3s² 3p⁶) is greater than Ar⁺ (3s² 3p⁵).
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (d) Both Assertion and Reason are false.

Explanation:
1. Both are false: the first IE of Ar (15.8 eV) is below the second (27.6 eV).
2. Zeff of Ar⁺ is larger than that of Ar, not smaller.

Teacher's Note:
1. First decide if the assertion is true, then if the reason is true, then whether the reason explains the assertion.
2. Revise the trend with two or three examples.

Question 13: Assertion (A): Electron affinity of fluorine is greater than chlorine.
Reason (R): Ionisation potential of fluorine is less than chlorine.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (d) Both Assertion and Reason are false.

Explanation:
1. Both are false: Cl has the higher EA and F has the higher IP.

Teacher's Note:
1. First decide if the assertion is true, then if the reason is true, then whether the reason explains the assertion.
2. Revise the trend with two or three examples.

Question 14: Assertion (A): IP of F > EA of F
Reason (R): F is a highly electronegative element
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.

Explanation:
1. Both are true. IP of F (1681) exceeds its EA (328).
2. Electronegativity is related to both, but it does not explain why IP is larger than EA.

Teacher's Note:
1. First decide if the assertion is true, then if the reason is true, then whether the reason explains the assertion.
2. Revise the trend with two or three examples.

Question 15: Assertion (A): Properties of Beryllium is similar to that of Aluminium
Reason (R): Both the elements belongs to same group
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (c) Assertion is true but the Reason is false.

Explanation:
1. Be and Al are similar (diagonal relationship), which is true.
2. But they are not in the same group (Be is group 2, Al is group 13), so the reason is false.

Teacher's Note:
1. First decide if the assertion is true, then if the reason is true, then whether the reason explains the assertion.
2. Revise the trend with two or three examples.

Question 16: Assertion (A): I.P. of first element in a period is minimum.
Reason (R): Effective nuclear charge of first element in a period is minimum
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.

Explanation:
1. Alkali metals have a single valence electron and the lowest Zeff in a period, giving the lowest IP.
2. The reason explains the assertion.

Teacher's Note:
1. First decide if the assertion is true, then if the reason is true, then whether the reason explains the assertion.
2. Revise the trend with two or three examples.

Question 17: Assertion (A): Stable electronic configuration does not affects electronegativity.
Reason (R): EN is the tendency of an atom to attract shared electrons, not to gain electrons.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.

Explanation:
1. Electronegativity is about attracting shared electrons, not about completing a stable configuration.
2. Both are true and the reason explains it.

Teacher's Note:
1. First decide if the assertion is true, then if the reason is true, then whether the reason explains the assertion.
2. Revise the trend with two or three examples.

Question 18: Assertion (A): Chlorine is most electronegative element.
Reason (R): Chlorine has tendency to loose electrons.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (d) Both Assertion and Reason are false.

Explanation:
1. Fluorine, not chlorine, is the most electronegative element.
2. Cl does not tend to lose electrons, so both are false.

Teacher's Note:
1. First decide if the assertion is true, then if the reason is true, then whether the reason explains the assertion.
2. Revise the trend with two or three examples.

Question 19: Assertion (A): Atomic radius increases, descending down the group.
Reason (R): On going down the group EN increase.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (c) Assertion is true but the Reason is false.

Explanation:
1. Atomic radius increases down a group, which is true.
2. Electronegativity decreases down a group, so the reason is false.

Teacher's Note:
1. First decide if the assertion is true, then if the reason is true, then whether the reason explains the assertion.
2. Revise the trend with two or three examples.

Question 20: Assertion (A): Atomic radius of inert gases are largest in the period
Reason (R): Effective nuclear charge of inert gases are minimum
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (c) Assertion is true but the Reason is false.

Explanation:
1. Noble gases have the largest radius (van der Waals) in the period, which is true.
2. Their Zeff is the highest, so the reason is false.

Teacher's Note:
1. First decide if the assertion is true, then if the reason is true, then whether the reason explains the assertion.
2. Revise the trend with two or three examples.

Question 21: Assertion (A): Electronegativity of nitrogen is greater than carbon.
Reason (R): Nit rogen has stable half filled electronic configuration.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.

Explanation:
1. N is more electronegative than C, and half filled stability is true.
2. But EN depends on Zeff and size, so the reason does not explain it.

Teacher's Note:
1. First decide if the assertion is true, then if the reason is true, then whether the reason explains the assertion.
2. Revise the trend with two or three examples.

Question 22: Assertion (A): Alkali metals have least 1st I.P. in the respective period
Reason (R): Alkali metals have only one electron in the valence shell.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.

Explanation:
1. Alkali metals have the lowest first IP in a period, and they do have one valence electron.
2. The low IP is due to large size and low Zeff, so the reason is not the full explanation.

Teacher's Note:
1. First decide if the assertion is true, then if the reason is true, then whether the reason explains the assertion.
2. Revise the trend with two or three examples.

Question 23: Assertion (A): Atomic size of Na is larger than Mg.
Reason (R): No. of shell in Mg is more than Na.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (c) Assertion is true but the Reason is false.

Explanation:
1. Na is larger than Mg, which is true.
2. Both have three shells, so the reason is false.

Teacher's Note:
1. First decide if the assertion is true, then if the reason is true, then whether the reason explains the assertion.
2. Revise the trend with two or three examples.

Question 24: Assertion (A): The 1st IP of Be is greater than that of B.
Reason (R): 2p orbital is lower in energy than 2s.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (c) Assertion is true but the Reason is false.

Explanation:
1. IE1 of Be (899) is above that of B (801), which is true.
2. The 2p orbital is higher in energy than 2s, so the reason is false.

Teacher's Note:
1. First decide if the assertion is true, then if the reason is true, then whether the reason explains the assertion.
2. Revise the trend with two or three examples.

Question 25: Assertion (A): Atomic sizes of Cs and Fr are almost similar.
Reason (R): Cs and Fr belong to same group.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.

Explanation:
1. Cs (265 pm) and Fr (270 pm) are similar in size, and they are in the same group.
2. The same group does not explain the similar size; it comes from poor shielding and relativistic effects.

Teacher's Note:
1. First decide if the assertion is true, then if the reason is true, then whether the reason explains the assertion.
2. Revise the trend with two or three examples.

Free study material for Chemistry

Practice MCQs for JEE Chemistry Classification Of Elements and Periodicity In Properties

About Classification Of Elements and Periodicity In Properties MCQs for JEE Chemistry

Test your conceptual understanding of Classification Of Elements and Periodicity In Properties with these targeted multiple-choice questions. Designed in alignment with the latest JEE curriculum for JEE Chemistry, these problem sets build accuracy and prepare students for objective exams.

How to Verify Your MCQ Answers

Each question includes structured solution keys mapped directly to standard JEE textbooks, helping students evaluate their reasoning and correct mistakes early in their revision.

Enhance Speed with Online MCQ Tests

Follow up your worksheet practice by attempting the interactive online Chemistry MCQ test for this chapter to evaluate your execution speed. All platform resources are free to access.

FAQs

Where can I access latest JEE Chemistry Classification of Elements and Periodicity in Properties MCQs Set 16?

You can get most exhaustive JEE Chemistry Classification of Elements and Periodicity in Properties MCQs Set 16 for free on StudiesToday.com. These MCQs for JEE Chemistry are updated for the 2026-27 academic session as per JEE examination standards.

Are Assertion-Reasoning and Case-Study MCQs included in the Chemistry JEE material?

Yes, our JEE Chemistry Classification of Elements and Periodicity in Properties MCQs Set 16 include the latest type of questions, such as Assertion-Reasoning and Case-based MCQs. 50% of the JEE paper is now competency-based.

How do practicing Chemistry MCQs help in scoring full marks in JEE exams?

By solving our JEE Chemistry Classification of Elements and Periodicity in Properties MCQs Set 16, JEE students can improve their accuracy and speed which is important as objective questions provide a chance to secure 100% marks in the Chemistry.

Do you provide answers and explanations for JEE Chemistry Classification of Elements and Periodicity in Properties MCQs Set 16?

Yes, Chemistry MCQs for JEE have answer key and brief explanations to help students understand logic behind the correct option as its important for 2026 competency-focused JEE exams.

Can I practice these Chemistry JEE MCQs online?

Yes, you can also access online interactive tests for JEE Chemistry Classification of Elements and Periodicity in Properties MCQs Set 16 on StudiesToday.com as they provide instant answers and score to help you track your progress in Chemistry.