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IIT JEE Chemistry Practice Paper – Part 12 covers the topic of Solutions, an important unit of Physical Chemistry. This section focuses on concentration terms, Raoult’s Law, vapor pressure, colligative properties (relative lowering of vapor pressure, elevation of boiling point, depression of freezing point, osmotic pressure), and Henry’s Law. These concepts are frequently tested in JEE Main and Advanced exams. By solving these questions, students can strengthen numerical ability, avoid common mistakes, and gain confidence in handling real exam problems. Q1. Which of the following is not a colligative property? (a) Relative lowering of vapor pressure (b) Elevation of boiling point (c) Depression of freezing point (d) Heat of vaporization Q2. Raoult’s law is applicable to: (a) Ideal solutions (b) Non-ideal solutions (c) Super-saturated solutions (d) Colloidal solutions Q3. The unit of molality is: (a) mol L–1 (b) mol kg–1 (c) g L–1 (d) g mol–1 Q4. Henry’s law relates solubility of a gas with: (a) Temperature (b) Pressure (c) Nature of solvent (d) Osmotic pressure Q5. Which colligative property is used to calculate molar masses of polymers? (a) Relative lowering of vapor pressure (b) Osmotic pressure (c) Elevation of boiling point (d) Depression of freezing point Q6. An azeotropic mixture shows: (a) Positive deviation from Raoult’s law only (b) Negative deviation from Raoult’s law only (c) Either positive or negative deviation (d) Ideal behavior Q7. The freezing point of 1 molal NaCl solution (assuming complete dissociation) compared to 1 molal glucose solution is: (a) Same (b) Lower (c) Higher (d) Unaffected Q8. Which concentration term is temperature independent? (a) Molarity (b) Molality (c) Normality (d) Mole fraction Q9. Osmotic pressure of a dilute solution is proportional to: (a) Molarity (b) Molality (c) Temperature only (d) Pressure Q10. Colligative properties depend on: (a) Nature of solute (b) Number of solute particles (c) Nature of solvent (d) Temperature only Submit Answers Solutions – IIT JEE Chemistry Notes The chapter Solutions is an important topic in Physical Chemistry for IIT JEE as it combines concepts of thermodynamics, equilibrium, and practical chemistry. A solution is a homogeneous mixture of two or more components, with the component present in larger quantity called the solvent, and the smaller one(s) called solute(s). Types of Solutions Depending on concentration, solutions can be dilute, concentrated, saturated, or supersaturated. Concentration Terms Students must master different ways of expressing concentration: Solubility Solubility depends on temperature, pressure, and nature of solute/solvent. Vapour Pressure & Raoult’s Law Colligative Properties These properties depend only on the number of solute particles: Colligative properties are also used to calculate molar mass of solutes, a favorite JEE question type. Key JEE Tips ✅ With solid conceptual clarity and practice of numericals, the Solutions chapter can help students secure crucial marks in IIT JEE.

IIT JEE Chemistry Practice Paper – Part 11 (Surface Chemistry) Instructions: This practice paper contains 10 multiple-choice questions from the topic Surface Chemistry. Each correct answer gives 4 marks. Attempt all and then click “Submit” to view your score, answers, and explanations. Q1. The process of accumulation of molecules at the surface rather than in the bulk is called: Absorption Adsorption Desorption Sorption Q2. Which of the following is an example of chemisorption? Adsorption of O₂ on charcoal Adsorption of H₂ on finely divided Ni Adsorption of NH₃ on silica gel Adsorption of iodine on starch Q3. Freundlich adsorption isotherm is represented as: x/m = kP x/m = kP^1/n x/m = k + P x/m = k/P Q4. Which of the following is used as a positive catalyst in the manufacture of NH₃ by Haber’s process? V₂O₅ Ni Fe Pt Q5. Which type of colloid is milk? Solid in gas Liquid in liquid Liquid in solid Gas in liquid Q6. Gold sol is prepared by: Reduction Oxidation Hydrolysis Peptization Q7. Which of the following is an example of lyophobic colloid? Gum Starch Gold sol Gelatin Q8. Which of the following is used to coagulate negatively charged colloids like arsenic sulphide sol? Cl⁻ ions OH⁻ ions Ba²⁺ ions SO₄²⁻ ions Q9. Tyndall effect is due to: Reflection of light Scattering of light Refraction of light Absorption of light Q10. Which type of catalysis is observed in the conversion of SO₂ to SO₃ in contact process? Homogeneous catalysis Heterogeneous catalysis Autocatalysis Enzyme catalysis

IIT JEE Chemistry Practice Paper – Part 10 (Electrochemistry) Instructions: This practice paper includes 10 multiple-choice questions from the topic Electrochemistry. Each correct answer gives you 4 marks. Attempt all and then click “Submit” to check your score, answers, and explanations. Q1. Standard electrode potential of Zn²⁺/Zn is –0.76 V and that of Cu²⁺/Cu is +0.34 V. The EMF of the cell Zn | Zn²⁺ || Cu²⁺ | Cu is: 0.10 V 1.10 V –1.10 V 0.76 V Q2. Which law states that the amount of substance deposited during electrolysis is proportional to the quantity of electricity passed? Ohm’s Law Faraday’s First Law Faraday’s Second Law Kohlrausch’s Law Q3. Molar conductivity of a strong electrolyte: Increases with dilution Decreases with dilution Remains constant First increases then decreases Q4. The unit of molar conductivity is: S m⁻¹ Ω m S cm² mol⁻¹ C mol⁻¹ Q5. For the reaction: Cu²⁺ + Zn → Cu + Zn²⁺, the reducing agent is: Cu²⁺ Cu Zn Zn²⁺ Q6. The slope of the graph of molar conductivity vs √C (for strong electrolyte) is related to: Kohlrausch’s Law Faraday’s Law Ohm’s Law Raoult’s Law Q7. The quantity of electricity required to deposit 1 mole of Al (Atomic mass = 27) from Al³⁺ ion is: 1 F 2 F 3 F 6 F Q8. The Nernst equation relates electrode potential with: Temperature only Pressure only Concentration of ions Heat of reaction Q9. In a Daniel cell, which of the following occurs? Cu is oxidised, Zn is reduced Zn is oxidised, Cu²⁺ is reduced Both Cu and Zn are oxidised Both Cu and Zn are reduced Q10. The electrochemical equivalent depends upon: Nature of electrolyte Nature of electrode Nature of substance deposited Quantity of electricity

IIT JEE Chemistry Practice Paper – Part 9 covers the topic of Solid State, a fundamental concept in Physical Chemistry. This section focuses on crystal lattices, unit cells, packing efficiency, defects in solids, and electrical properties. Many tricky and conceptual questions are asked from this topic in JEE Main and Advanced. In this practice paper, you will find 10 carefully selected multiple-choice questions inspired by previous years’ exams. Each question comes with detailed solutions and explanations to help you clear concepts, avoid common mistakes, and build the confidence needed to tackle Solid State questions in the actual exam. IIT JEE Chemistry Practice Paper – Part 9 (Solid State) Instructions: Attempt all 10 questions. Each correct answer carries 4 marks. No negative marking here. After submitting, you’ll see your score, number of correct/wrong answers, and explanations. Q1. Which of the following is an example of ionic solid? Diamond Sodium chloride Graphite Ice Q2. In body-centered cubic (bcc) arrangement, the coordination number of each atom is: 4 6 8 12 Q3. The packing efficiency in a face-centered cubic (fcc) lattice is: 52.4% 68.0% 74.0% 60.0% Q4. Schottky defect is observed in: KCl ZnS AgCl FeO Q5. Which type of solid shows electrical conductivity in solid as well as molten state? Covalent solids Ionic solids Metallic solids Molecular solids Q6. The number of atoms per unit cell in a simple cubic structure is: 1 2 4 6 Q7. Frenkel defect is usually observed in: NaCl KCl AgBr CsCl Q8. The edge length of a unit cell is 400 pm. If it is fcc, the radius of the atom is approximately: 141 pm 200 pm 282 pm 173 pm Q9. Which of the following is not a crystalline solid? Quartz Glass Sodium chloride Diamond Q10. In hexagonal close packing (hcp), the percentage of empty space is: 26% 32% 40% 20%

IIT JEE Chemistry Practice Paper – Previous Years’ Questions Part 7: Redox Reactions Q1. In the reaction: Zn + CuSO₄ → ZnSO₄ + Cu, which element is oxidized? a) Cu b) Zn c) S d) O Q2. In which of the following reactions is H₂O₂ acting as an oxidizing agent? a) 2H₂O₂ → 2H₂O + O₂ b) H₂O₂ + 2KI + H₂SO₄ → I₂ + 2H₂O + K₂SO₄ c) H₂O₂ + Na₂SO₃ → Na₂SO₄ + H₂O d) H₂O₂ + Cl₂ → 2HCl + O₂ Q3. The oxidation number of Cr in K₂Cr₂O₇ is: a) +2 b) +3 c) +6 d) +7 Q4. Which of the following is a disproportionation reaction? a) Cl₂ + 2OH⁻ → Cl⁻ + ClO⁻ + H₂O b) Zn + Cu²⁺ → Zn²⁺ + Cu c) Fe²⁺ + MnO₄⁻ → Fe³⁺ + Mn²⁺ d) Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag Q5. Which of the following statements about oxidizing agents is correct? a) They undergo reduction b) They undergo oxidation c) They always contain oxygen d) They always contain halogens Q6. The change in oxidation number of Mn in KMnO₄ when it acts as an oxidizing agent in acidic medium is: a) +7 to +2 b) +7 to +4 c) +7 to +6 d) +7 to +5 Q7. In the reaction: 2FeCl₃ + SnCl₂ → 2FeCl₂ + SnCl₄, the reducing agent is: a) FeCl₃ b) SnCl₂ c) FeCl₂ d) SnCl₄ Q8. Which of the following reactions is NOT a redox reaction? a) CaCO₃ → CaO + CO₂ b) 2Mg + O₂ → 2MgO c) Zn + 2HCl → ZnCl₂ + H₂ d) Fe²⁺ + Cl₂ → Fe³⁺ + 2Cl⁻ Q9. In acidic medium, MnO₂ acts as an oxidizing agent and changes into: a) Mn²⁺ b) Mn³⁺ c) MnO₄⁻ d) Mn Q10. In which of the following is the oxidation number of nitrogen highest? a) NH₃ b) NO₂ c) HNO₃ d) N₂ Submit These IIT JEE Chemistry practice quizzes are highly useful for students as they provide structured, exam-oriented preparation. Each quiz is topic-specific, allowing aspirants to revise one concept at a time and strengthen their weak areas. The format follows the real JEE exam pattern, with multiple-choice questions and negative marking awareness, which helps students build accuracy and time management skills. Detailed explanations after every question enhance conceptual clarity and prevent repetitive mistakes. Since the quizzes are self-evaluating, students can measure progress instantly and adapt their study strategy accordingly, ensuring consistent improvement and confidence for IIT JEE success.

IIT JEE Chemistry Practice Paper – Previous Years’ Questions Part 6: Thermodynamics Answer the following multiple-choice questions. Each correct answer carries 4 marks. Submit to see your score and explanations. 1. The enthalpy change for a reaction does not depend upon: a) Physical state of reactants b) Temperature of reaction c) Path of the reaction d) Physical state of products 2. Which law of thermodynamics introduces the concept of entropy? a) Zeroth Law b) First Law c) Second Law d) Third Law 3. The internal energy of an ideal gas depends on: a) Pressure only b) Volume only c) Temperature only d) Both pressure and volume 4. In an isothermal process, the change in internal energy of an ideal gas is: a) Positive b) Negative c) Zero d) Depends on pressure 5. Gibbs free energy is given by: a) G = H + TS b) G = H – TS c) G = U + PV d) G = U – PV 6. The enthalpy of neutralization of a strong acid with a strong base is approximately: a) –57 kJ/mol b) –100 kJ/mol c) +57 kJ/mol d) 0 kJ/mol 7. A process in which no heat enters or leaves the system is called: a) Isothermal b) Isobaric c) Isochoric d) Adiabatic 8. For a spontaneous reaction at constant temperature and pressure: a) ΔG > 0 b) ΔG < 0 c) ΔH > 0 d) ΔS < 0 9. In which process is work done maximum? a) Reversible process b) Irreversible process c) Isobaric process d) Isochoric process 10. The First Law of Thermodynamics is a statement of: a) Conservation of energy b) Conservation of entropy c) Conservation of enthalpy d) Conservation of mass Submit

IIT JEE Chemistry Practice Paper – Part 4 Topic: States of Matter Attempt the following multiple-choice questions based on States of Matter. Each correct answer carries 4 marks. Submit at the end to check your score with explanations. Q1. Which of the following is not an assumption of the kinetic theory of gases? (a) Gas molecules are in constant random motion (b) Intermolecular forces are negligible (c) Volume of gas molecules is negligible compared to container (d) All collisions are inelastic Q2. The compressibility factor (Z) is defined as: (a) Z = PV/RT (b) Z = RT/PV (c) Z = nRT/PV (d) Z = V/nRT Q3. At Boyle’s temperature, a real gas shows: (a) Maximum deviation from ideal behavior (b) No deviation from ideal behavior (c) Liquefaction (d) Negative pressure Q4. Which law states that at constant temperature, pressure of a fixed mass of gas is inversely proportional to its volume? (a) Charles’ Law (b) Boyle’s Law (c) Avogadro’s Law (d) Gay-Lussac’s Law Q5. Critical temperature of a gas is the temperature: (a) Above which gas cannot be liquefied (b) At which gas shows ideal behavior (c) At which pressure is zero (d) Below which volume is negligible Q6. Which gas law forms the basis of absolute temperature scale? (a) Avogadro’s Law (b) Charles’ Law (c) Boyle’s Law (d) Dalton’s Law Q7. Real gases approach ideal behavior at: (a) Low temperature and high pressure (b) High temperature and low pressure (c) Low temperature and low pressure (d) High temperature and high pressure Q8. Which of the following plots is a straight line for an ideal gas at constant temperature? (a) P vs V (b) V vs T (c) P vs 1/V (d) PV vs P Q9. Van der Waals’ constant ‘a’ is a measure of: (a) Size of molecules (b) Pressure correction (c) Intermolecular attraction (d) Molecular mass Q10. Diffusion of gases is governed by: (a) Dalton’s Law (b) Graham’s Law (c) Boyle’s Law (d) Avogadro’s Law Submit