JEE Advanced Chemistry Questions 2025: Important Topics

JEE Advanced Chemistry Important Questions: Candidates looking to strengthen their exam preparation for JEE Advanced 2025 must look into practising as many JEE Advanced previous year question papers as possible. It will help them in analysing which areas need more attention. This will not only help them in creating a proper study plan but will also assist them in being confident in their exam preparation.

This article lists previous year’s question papers of JEE Advanced along with the solutions. The questions provided in the article are incredibly crucial for IIT-JEE exam preparation. We have provided previous years’ questions and solutions for IIT-JEE Advanced. These questions are an excellent resource for reviewing important topics and understanding the exam pattern. Read more to learn more about the IIT JEE Chemistry questions.

JEE Advanced Latest Updates:
— IIT JEE (Advanced) 2025 is scheduled on May 18, 2025.

JEE Advanced Chemistry Important Questions 2025

Practising the previous year’s topic-wise Chemistry questions can help candidates gain confidence in their learning abilities. Solving IIT-JEE previous year papers has the advantage of exposing candidates to the types of questions that will be asked in the JEE test. Before getting into the JEE Advanced important Chemistry questions, let us acquaint candidates with the exam overview:

JEE Advanced 2025 All India Mock Test Series (AITS)

The JEE Advanced mock exams created by Embibe’s subject-matter specialists are clearly written and have a track record of success for the JEE Advanced 2025 exam. Only three to four practice exams will significantly improve the candidates’ performance. Use the steps below to register and start taking practice exams right away!

• 1st Step: Visit Embibe’s official website, i.e., www.embibe.com.
• 2nd Step: Login through the registered mobile number/email.
• 3rd Step: Then select Goal as JEE Advanced under Engineering. Then, click on Next and select your preferred language.
• 4th Step: Once done, click the links below to take the test.

JEE Advanced Chemistry Important Questions and Answers

Here are some Chemistry JEE Advanced questions for all JEE Advanced candidates below.

Question 1: Which of the following liberates O₂ upon hydrolysis?

1. Pb₃O₄
2. KO₂
3. Na₂O₂
4. Li₂O₂

Ans: 2

Question 2: A colourless aqueous solution contains nitrates of two metals, X and Y. When it was added to an aqueous solution of NaCl, a white precipitate was formed. This precipitate was found to be partially soluble in hot water to give a residue P and a solution Q. The residue P was soluble in aq. NH₃ and also in excess sodium thiosulfate. The hot solution Q gave a yellow precipitate with KI. The metals X and Y, respectively, are

1. Ag and Pb
2. Ag and Cd
3. Cd and Pb
4. Cd and Zn

Ans: 1

Question 3: Newman projections P, Q, R, and S are shown below:

Which one of the following options represents identical molecules?

1. P and Q
2. Q and S
3. Q and R
4. R and S

Ans: 3

JEE Advanced Organic Chemistry Questions:

Question 4: Which of the following structures has the IUPAC name 3-ethynyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid?

Question 5. In thermodynamics, the ? − ? work done is given by \(w=-\int dVP_{ext}\). For a system undergoing a particular process, the work done is \(w=-\int dV{(\frac{RT}{V-b}-\frac a{V^2})}\). This equation is applicable to the following:

1. System that satisfies the van der Waals equation of state.
2. Process that is reversible and isothermal.
3. Process that is reversible and adiabatic.
4. Process that is irreversible and at constant pressure.

Ans: 1, 2, 3

Question 6: With respect to hypochlorite, chlorate, and perchlorate ions, choose the correct statement(s).

1. The hypochlorite ion is the strongest conjugate base.
2. The molecular shape of only chlorate ion is influenced by the lone pair of electrons of Cl.
3. The hypochlorite and chlorate ions are disproportionate, giving rise to an identical set of ions.
4. The hypochlorite ion oxidizes the sulphite ion.

Ans: 1, 2, 4

Question 7: 5.00 mL of 0.10 M oxalic acid solution taken in a conical flask is titrated against NaOH from a burette using a phenolphthalein indicator. The volume of NaOH required for the appearance of a permanent faint pink colour is tabulated below for five experiments. What is the concentration, in molarity, of the NaOH solution?

Ans: 0.11

Question 8: Consider a 70% efficient hydrogen-oxygen fuel cell working under standard conditions at 1 bar and 298 K. Its cell reaction is

H₂(g) + ½ O₂(g) → H₂O(l)

The work derived from the cell on the consumption of 1.0 × 10⁻³mol of H₂(?) is used to compress 1.00 mol of a monoatomic ideal gas in a thermally insulated container. What is the change in the temperature (in K) of the ideal gas?

The standard reduction potentials for the two half-cells are given below:

O₂(?) + 4H⁺(??) + 4?⁻ → 2 H₂O (?), ?⁰ = 1.23 V,
2H⁺(??) + 2?⁻ → H₂ (?), ?⁰ = 0.00 V
Use ? = 96500 C mol⁻¹, R = 8.314 J mol⁻¹ K⁻¹.

Ans: 13.32

Question 9: Aluminium reacts with sulfuric acid to form aluminium sulphate and hydrogen. What is the volume of hydrogen gas in litres (L) produced at 300 K and 1.0 ATM pressure when 5.4 g of aluminium and 50.0 mL of 5.0 M sulfuric acid are combined for the reaction?
(Use molar mass of aluminium as 27.0 g mol⁻¹,? = 0.082 ATM L mol⁻¹ K⁻¹)

Ans: 6.15 litres

Question 10: To measure the quantity of MnCl2 dissolved in an aqueous solution, it was completely converted to KMnO4 using the reaction

MnCl₂ + K₂S₂O₈ + H₂O → KMnO₄ + H₂SO₄ + HCl (equation not balanced).

A few drops of concentrated HCl were added to this solution and gently warmed. Further, oxalic acid (225 g) was added in portions till the colour of the permanganate ion disappeared. The quantity of MnCl2 (in mg) present in the initial solution is ______. (Atomic weights in g mol–1: Mn = 55, Cl = 35.5)

Ans: 126 mg

Question 11: For the reaction:
I^– + ClO^-3 + H₂SO₄ → Cl^– + HSO₄^– + I₂
The correct statement(s) in the balanced equation is/are:

1. Stoichiometric coefficient HSO₄^– of is 6
2. Iodide is oxidized
3. Sulphur is reduced
4. H₂O is one of the products

Ans: 1, 2 and 4

Question 12: Consider a titration of potassium dichromate solution with acidified Mohr’s salt solution using diphenylamine as an indicator. The number of moles of Mohr’s salt required per mole of dichromate is:

Ans: 6

Question 13: Which ordering of compounds is according to the decreasing order of the oxidation state of nitrogen?

1. HNO₃, NO, NH₄Cl, N₂
2. HNO₃, NO, N₂, NH₄Cl
3. HNO₃, NH₄Cl, NO, N₂
4. NO, HNO₃, NH₄Cl, N₂

Ans: 2

Question 14: \({}_{92}^{238}\text{u}\) is known to undergo radioactive decay to form \({}_{82}^{206}\text{Pb}\) by emitting alpha and beta particles. A rock initially contained 68 × 10⁻⁶ g of \({}_{92}^{238}\text{u}\). If the number of alpha particles that it would emit during its radioactive decay \({}_{92}^{238}\text{u}\) to \({}_{82}^{206}\text{Pb}\) of to in three half-lives is ? × 10¹⁸, then what is the value of ??

Ans: 1.21

JEE Advanced Organic Chemistry

Question 15: In the following reaction, compound Q is obtained from compound P via an ionic intermediate.

What is the degree of unsaturation of Q?

Ans: 18

Question 16: Consider the reaction A ⇌ B at 1000 K. At time?, the system’s temperature was increased to 2000 K, and the system was allowed to reach equilibrium. Throughout this experiment, the partial pressure of A was maintained at 1 bar. Given below is the plot of the partial pressure of B with time. What is the standard Gibbs energy ratio of the reaction at 1000 K to 2000 K?

Ans: 0.25

Question 17: The cubic unit cell structure of a compound containing cation M and anion X is shown below. When compared to the anion, the cation has a smaller ionic radius. Choose the correct statement(s).

1. The empirical formula of the compound is MX.
2. The cation M and anion X have different coordination geometries.
3. The ratio of M-X bond length to the cubic unit cell edge length is 0.866.
4. The ratio of the ionic radii of cation M to anion X is 0.414.

Ans: 1, 3

Question 18: Choose the correct statement(s) among the following:

1. [FeCl₄]⁻ has tetrahedral geometry.
2. [Co(en)(NH₃)₂Cl₂]⁺has 2 geometrical isomers.
3. [FeCl₄]⁻ has a higher spin-only magnetic moment than [Co(en)(NH₃)₂Cl₂]⁺.
4. The cobalt ion in [Co(en)(NH₃)₂Cl₂]⁺ has s?³?² hybridization.

Ans: 1, 3

Question 19: In the reaction scheme shown below, Q, R, and S are the major products.

The correct structure of

Ans: b, d.

Important Topics in JEE Advanced Chemistry

Chemistry has a lot of comparable definitions, formulas, different preparation methods, equations, solutions, balancing equations, various substances and their properties, and so on. The topic is relatively broad, with many other topics and subtopics. Because of the interconnectedness of these topics, chemistry is complicated.

For candidates who are unsure where to start, here are a few key Chemistry concepts to get them started on the Chemistry JEE Advanced paper:

FAQs on JEE Advanced 2025 Important Chemistry Questions

Here are some of the frequently asked questions on JEE Advanced Chemistry questions in the below-mentioned section:

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