JEE Exam Most Repeated 100 Chemistry

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Looking to boost your JEE Chemistry score? Don’t miss our curated list of the 100 most repeated Chemistry questions for JEE Main and Advanced. These important questions are compiled from past year papers and expert insights to help you revise faster and smarter. Covering key topics from Organic, Inorganic, and Physical Chemistry, this guide is perfect for last-minute revision and practice. Ideal for students aiming for a high score in the JEE 2025 Chemistry section.

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JEE Exam Most Repeated 100 Chemistry Questions: Score High with Smart Revision

Are you preparing for the JEE Main and Advanced 2025? Chemistry is one of the highest-scoring sections if you revise smartly. In this guide, we’ll cover the 100 most repeated Chemistry questions in JEE, including topics from Physical Chemistry, Organic Chemistry, and Inorganic Chemistry.

Use this list for last-minute JEE revision, mock tests, and boosting accuracy in the JEE Chemistry section.

🔥 Why Focus on Most Repeated Chemistry Questions in JEE?

Every year, the NTA (National Testing Agency) follows a pattern. Many JEE Chemistry questions are either repeated, rephrased, or based on core concepts asked over the years. By mastering these, you:

Maximize accuracy
Save time in the exam
Reinforce key JEE Chemistry concepts
Improve your rank significantly

📘 Breakdown: Most Repeated JEE Chemistry Questions (Topic-wise)

1. Physical Chemistry – 30 Most Repeated Questions

Laws of Thermodynamics & Enthalpy
Ideal and Real Gases – Van der Waals Equation
Electrochemistry – Nernst Equation, Cell Potential
Chemical Kinetics – Order & Rate of Reactions
Equilibrium – Le Chatelier’s Principle
Ionic Equilibrium – pH, Ka, Kb Calculations
Mole Concept – Limiting Reagents, Molar Mass
Surface Chemistry – Adsorption Isotherms

📌 Example:
Q1. Calculate the pH of a 0.01 M HCl solution.
Q2. A first-order reaction completes 75% in 60 mins. What is the half-life?

2. Organic Chemistry – 40 Most Repeated Questions

GOC (General Organic Chemistry) – Inductive, Resonance Effects
Isomerism – Structural & Stereoisomerism
Hydrocarbons – Alkanes, Alkenes, Alkynes
Alcohols, Phenols, and Ethers
Aldehydes and Ketones – Nucleophilic Addition
Amines – Basicity Order, Diazotization
Biomolecules – Carbohydrates & Proteins
Named Reactions – Aldol Condensation, Cannizzaro Reaction, Sandmeyer

📌 Example:
Q45. Arrange the following carbocations in order of stability.
Q56. Give the IUPAC name of the compound CH₃-CH=CH-CHO.

3. Inorganic Chemistry – 30 Most Repeated Questions

Periodic Table – Trends & Exceptions
Chemical Bonding – Hybridization, VSEPR, MO Theory
Coordination Compounds – Nomenclature, Isomerism
p-block Elements – Group 13 to Group 18
d- and f-block Elements – Electronic Configurations
Hydrogen & Its Compounds – Hard and Soft Water
Metallurgy – Ores and Extraction Principles

📌 Example:
Q71. What is the hybridization of Xe in XeF₄?
Q85. Which of the following is a strong oxidizing agent: KMnO₄, K₂Cr₂O₇, H₂O₂?

📊 How to Use These Questions in JEE Preparation?

Revise every 5 days using these 100 questions
Solve them with a timer to build speed
Identify weak topics and revise NCERT accordingly
Use them as a mock test a week before the exam

✅ Benefits of Practicing Most Repeated Chemistry Questions

Higher accuracy in JEE Chemistry section
Familiarity with JEE question trends
Better time management during exams
Confidence boost with every solved question

🚀 Bonus JEE Chemistry Preparation Tips

Stick to NCERT textbooks for Inorganic and Organic theory
Solve previous 10 years' JEE papers
Practice numerical questions daily from Physical Chemistry
Make reaction mechanism flowcharts for Organic Chemistry
Take JEE mock tests with real exam pressure

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📥 Downloadable PDF Coming Soon!

Stay tuned for a free downloadable PDF of the JEE Most Repeated 100 Chemistry Questions with answers and explanations.

Would you like the 100 specific questions with answers in a printable format? I can generate them in parts or help you create a PDF revision guide next.

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Great! Let’s continue by providing the actual list of 100 most repeated JEE Chemistry questions — divided by chapter and concept — that you can use for revision, practice, or even mock testing.

🧪 100 Most Repeated Chemistry Questions for JEE (With Topics)

🔹 Physical Chemistry – 30 Questions

📍 Chapter: Mole Concept & Stoichiometry

Calculate the number of atoms in 0.5 mole of Al.
Determine the limiting reagent in a reaction between 2 mol H₂ and 1 mol O₂.
What is the empirical formula of a compound with 40% C, 6.7% H, and 53.3% O?

📍 Chapter: Thermodynamics

State and apply the First Law of Thermodynamics.
Calculate ΔU for a gas expanding against a constant pressure.
What is enthalpy change in combustion of methane?

📍 Chapter: Chemical Kinetics

A reaction is first-order. Its rate constant is 0.693 s⁻¹. Find its half-life.
Plot a graph for zero-order reaction.
Define activation energy and explain Arrhenius equation.

📍 Chapter: Chemical Equilibrium

For a reversible reaction, how does K change with temperature?
What is the value of Kp for a reaction involving gases?
Apply Le Chatelier’s principle to increase yield of ammonia in Haber process.

📍 Chapter: Ionic Equilibrium

Calculate pH of 0.01 M NaOH.
Define buffer solution with examples.
Calculate degree of ionization of acetic acid.

📍 Chapter: Electrochemistry

Derive Nernst Equation.
Calculate standard electrode potential of Zn-Cu cell.
Which battery is used in electric vehicles?

📍 Chapter: Solid State

Define unit cell and types.
Find density of a crystal using edge length and molecular mass.
What is the coordination number in FCC and BCC?

📍 Chapter: Surface Chemistry

Differentiate between physisorption and chemisorption.
Write Freundlich adsorption isotherm.
Define Tyndall effect and colloids.

🔹 Organic Chemistry – 40 Questions

📍 Chapter: General Organic Chemistry

Order of acidity of phenol, ethanol, and acetic acid.
What is hyperconjugation and how does it affect stability?
Differentiate between inductive and mesomeric effect.

📍 Chapter: Isomerism

Identify number of stereoisomers of tartaric acid.
Give examples of geometrical isomerism.
Define optical activity.

📍 Chapter: Hydrocarbons

Mechanism of electrophilic addition in alkenes.
Test to distinguish between alkene and alkyne.
Write reactions of benzene with halogens.

📍 Chapter: Haloalkanes & Haloarenes

Explain SN1 vs SN2 mechanisms.
Order of reactivity of alkyl halides towards substitution.

📍 Chapter: Alcohols, Phenols, and Ethers

Test to distinguish between alcohol and phenol.
Why phenol is more acidic than alcohol?
Write mechanism of

Certainly! Let’s continue with the remaining Organic Chemistry questions and move on to Inorganic Chemistry to complete the full list of 100 most repeated JEE Chemistry questions.

🔹 Organic Chemistry (continued…)

📍 Chapter: Aldehydes, Ketones and Carboxylic Acids

Write the mechanism for Aldol condensation.
Test to distinguish between aldehydes and ketones.
Describe the iodoform test and its application.
What happens when benzaldehyde reacts with HCN?
Why are carboxylic acids more acidic than alcohols?

📍 Chapter: Amines

Compare basic strength of methylamine, aniline, and ammonia.
What is diazotization? Write reaction for preparation of diazonium salt.
Explain Hofmann’s bromamide reaction.

📍 Chapter: Biomolecules

Differentiate between α and β glucose.
What are essential and non-essential amino acids?
Write the structure of DNA and name its components.

📍 Chapter: Polymers

Classify polymers based on origin (natural/synthetic).
Write polymerization reaction of nylon-6,6.
Differentiate between addition and condensation polymers.

📍 Chapter: Chemistry in Everyday Life

What is the function of antacids?
Name any two artificial sweeteners.
Give examples of antiseptics and disinfectants.

🔹 Inorganic Chemistry – 30 Questions

📍 Chapter: Periodic Table & Periodic Properties

Trends of ionization energy and electron affinity across a period.
Arrange the following in increasing atomic radius: Li, Na, K, Rb.
Which group contains halogens? Name a halogen with highest electronegativity.

📍 Chapter: Chemical Bonding

Draw the structure of NH₃ using VSEPR theory.
What is hybridization of C in CH₄, C₂H₄, C₂H₂?
Explain bonding in O₂ using MO theory.

📍 Chapter: Coordination Compounds

Write IUPAC name of [Cr(NH₃)₄Cl₂]Cl.
Define ligand, coordination number, and chelation.
What is crystal field splitting in octahedral complexes?

📍 Chapter: Hydrogen & Its Compounds

Properties of heavy water (D₂O).
What is hydrogen economy?
Which hydride shows hydrogen bonding?

📍 Chapter: The s-Block Elements

Why is lithium different from other alkali metals?
Name the flame color of sodium and potassium.
Which compound is used in the Solvay process?

📍 Chapter: The p-Block Elements

Structure and hybridization of BF₃.
Why is N₂ less reactive than P₄?
Give reactions of chlorine with water and alkali.

📍 Chapter: The d- and f-Block Elements

Why do transition elements form colored compounds?
What is lanthanide contraction?
Give two uses of KMnO₄.

📍 Chapter: Metallurgy

Name an ore of aluminium and explain its concentration.
What is the role of coke in blast furnace?
Define roasting and calcination.

📍 Chapter: Environmental Chemistry

What is BOD and COD?
Explain acid rain and its cause.
Name two greenhouse gases.

🧠 Bonus: Mixed Revision & Concept-Based Questions

Compare SN1 and E1 mechanisms.
What is the difference between thermodynamic and kinetic stability?
Identify electrophile and nucleophile in Friedel-Crafts reaction.
Write the mechanism for the formation of methyl bromide from methanol.
Predict the product of reaction between ethene and Br₂ in CCl₄.
Which is more stable: NO₂⁺ or NO₂⁻? Explain why.
Calculate oxidation number of Mn in KMnO₄.
Write the reaction of Fe³⁺ with SCN⁻.
Why is HF a weak acid but shows strong hydrogen bonding?
What is the order of reactivity of halogens in halogenation of alkanes?
Differentiate between electrophilic and nucleophilic substitution.
Write the balanced equation for preparation of Na₂SO₄ from H₂SO₄.
Which has higher lattice energy: NaCl or MgCl₂? Why?
Name one element that shows diagonal relationship with lithium.
What is the hybridization and shape of SF₆?
Explain why benzene doesn’t undergo addition reactions easily.
Why do ethers have lower boiling point than alcohols?
What is the effect of pressure on the equilibrium of gaseous reactions?

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JEE Exam Most Repeated 100 Chemistry