JEE Chemistry

Stoichiometry & Calculations: JEE Questions & Solutions

57 previous-year JEE Chemistry questions on Stoichiometry & Calculations, each with a worked step-by-step solution.

Intermediate

Previous-year questions

  1. 0180 mL of a hydrocarbon on mixing with 264 mL of oxygen in a closed U-tube undergoes complete combustion. The residual gases after cooling…MCQMediumJEE 2026
  2. 0214.0 g of calcium metal is allowed to react with excess HCl at 1.0 atm pressure and 273 K. Which of the following statements is incorrect?…MCQEasyJEE 2026
  3. 03By usual analysis, 1.00 g of compound (X) gave 1.79 g of magnesium pyrophosphate. The percentage of phosphorus in compound (X) is: (nearest…MCQEasyJEE 2026
  4. 04Aqueous HCl reacts with MnO₂(s) to form MnCl₂(aq), Cl₂(g) and H₂O(l). What is the weight (in g) of Cl₂ liberated when 8.7 g of MnO₂(s) is…MCQEasyJEE 2026
  5. 05In the reaction, 2Al(s) + 6HCl(aq) → 2Al³⁺(aq) + 6Cl⁻(aq) + 3H₂(g)MCQEasyJEE 2026
  6. 06A + 2B → AB₂ 36.0 g of A (Molar mass = 60 g mol⁻¹) and 56.0 g of B (Molar mass = 80 g mol⁻¹) are allowed to react. Which of the following…MCQMediumJEE 2026
  7. 07The mass of benzanilide obtained from the benzoylation reaction of 5.8 g of aniline, if yield of product is 82%, is g (nearest integer).…NVAEasyJEE 2026
  8. 08x mg of pure HCl was used to make an aqueous solution. 25.0 mL of 0.1 M Ba(OH)₂ solution is used when the HCl solution was titrated against…NVAEasyJEE 2026
  9. 09A student has planned to prepare acetanilide from aniline using acetic anhydride. The student has started from 9.3 g of aniline. However,…MCQEasyJEE 2026
  10. 10For the given reaction: CaCO3 + 2HCl -> CaCl2 + H2O + CO2 If 90 g CaCO3 is added to 300 mL of HCl which contains 38.55% HCl by mass and has…MCQMediumJEE 2026
  11. 11Some CO₂ gas was kept in a sealed container at a pressure of 1 atm and at 273 K. This entire amount of CO₂ gas was later passed through an…NVAMediumJEE 2025
  12. 12What amount of bromine will be required to convert 2 g of phenol into 2, 4, 6-tribromophenol? (Given molar mass in g mol⁻¹ of C, H, O, Br…MCQEasyJEE 2025
  13. 13During "S" estimation, 160 mg of an organic compound gives 466 mg of barium sulphate. The percentage of Sulphur in the given compound is %.…NVAEasyJEE 2025
  14. 140.01 mole of an organic compound (X) containing 10% hydrogen, on complete combustion, produced 0.9 g H₂O. Molar mass of (X) is g mol⁻¹.NVAEasyJEE 2025
  15. 15When 81.0 g of aluminium is allowed to react with 128.0 g of oxygen gas, the mass of aluminium oxide produced in grams is (nearest integer).NVAEasyJEE 2025
  16. 16For a reaction, N₂O₅(g) → 2NO₂(g) + 1/2 O₂(g) in a constant volume container, no products were present initially. The final pressure of the…MCQEasyJEE 2025
  17. 17X g of benzoic acid on reaction with aqueous NaHCO₃ release CO₂ that occupied 11.2 L volume at STP. X is g.NVAEasyJEE 2025
  18. 18Consider the following reaction occurring in the blast furnace. Fe₃O₄(s) + 4CO(g) → 3Fe(l) + 4CO₂(g) ‘x’ kg of iron is produced when 2.32 ×…NVAMediumJEE 2025
  19. 19The elemental composition of a compound is 54.2% C, 9.2% H, and 36.6% O. If the molar mass of the compound is 132 g/mol, the molecular…MCQMediumJEE 2025
  20. 20The molarity of a 70% (mass/mass) aqueous solution of a monobasic acid (X) is M. [Given: density of the aqueous solution of X is 1.25 g…NVAEasyJEE 2025
  21. 210.1 M solution of KI reacts with excess of H₂SO₄ and KIO₃, according to the equation: 5I⁻ + IO₃⁻ + 6H⁺ → 3I₂ + 3H₂O Identify the correct…MCQMediumJEE 2025
  22. 22In the Claisen-Schmidt reaction to prepare dibenzalacetone from 5.3 g benzaldehyde, a total of 3.51 g of product was obtained. The…NVAEasyJEE 2025
  23. 23CaCO₃(s) + 2HCl(aq) → CaCl₂(aq) + CO₂(g) + H₂O(l) Consider the above reaction. What mass of CaCl₂ will be formed if 250 mL of 0.76 M HCl…MCQEasyJEE 2025
  24. 24On complete combustion 1.0 g of an organic compound (X) gave 1.46 g of CO₂ and 0.567 g of H₂O. The empirical formula mass of compound (X)…MCQMediumJEE 2025
  25. 250.5 g of an organic compound on combustion gave 1.46 g of CO₂ and 0.9 g of H₂O. The percentage of carbon in the compound is (Nearest…NVAEasyJEE 2025
  26. 2610 mL of 2 M NaOH solution is added to 20 mL of 1 M HCl solution kept in a beaker. Now, 10 mL of this mixture is poured into a volumetric…MCQEasyJEE 2025
  27. 27Mass of magnesium required to produce 220 mL of hydrogen gas at STP on reaction with excess of dil. HCl is Given: Molar mass of Mg is 24 g…MCQEasyJEE 2025
  28. 28X g of nitrobenzene on nitration gave 4.2 g of m-dinitrobenzene. X = g. (nearest integer) [Given: molar mass (in g mol⁻¹) C: 12, H: 1, O:…NVAEasyJEE 2025
  29. 29Fortification of food with iron is done using FeSO₄· 7H₂O. The mass in grams of the FeSO₄· 7H₂O required to achieve 12 ppm of iron in 150…NVAEasyJEE 2025
  30. 30The amount of calcium oxide produced on heating 150 kg limestone (75% pure) is kg. (Nearest integer) Given: Molar mass (in g mol⁻¹) of…NVAEasyJEE 2025
  31. 31An organic compound weighing 500 mg, produced 220 mg of CO₂ on complete combustion. The percentage composition of carbon in the compound is…NVAEasyJEE 2025
  32. 32Butane reacts with oxygen to produce carbon dioxide and water following the equation given below: C₄H₁₀(g) + 13/2 O₂(g) → 4CO₂(g) + 5H₂O(l)…NVAMediumJEE 2025
  33. 3320 mL of sodium iodide solution gave 4.74 g silver iodide when treated with excess of silver nitrate solution. The molarity of the sodium…NVAEasyJEE 2025
  34. 34Mass of methane required to produce 22 g of CO₂ after complete combustion is g.NVAEasyJEE 2024
  35. 359.3 g of aniline is subjected to reaction with excess of acetic anhydride to prepare acetanilide. The mass of acetanilide produced if the…NVAEasyJEE 2024
  36. 36If 50 mL of 0.5 M oxalic acid is required to neutralise 25 mL of NaOH solution, the amount of NaOH in 50 mL of the given NaOH solution is:MCQMediumJEE 2024
  37. 37The density of a monobasic strong acid (Molar mass 24.2 g mol⁻¹) is 1.21 kg L⁻¹. The volume of its solution required for the complete…NVAEasyJEE 2023
  38. 38Number of hydrogen atoms per molecule of a hydrocarbon A having 85.8% carbon is: Given: Molar mass of A = 84 g/molNVAEasyJEE 2023
  39. 39When a hydrocarbon A undergoes combustion in the presence of air, it requires 9.5 equivalents of oxygen and produces 3 equivalents of…MCQEasyJEE 2023
  40. 40A 300 mL bottle of soft drink has 0.2 M CO₂ dissolved in it. Assuming CO₂ behaves as an ideal gas, the volume of the dissolved CO₂ at STP…NVAEasyJEE 2023
  41. 41The strength of 50 volume solution of hydrogen peroxide is..... g/L (Nearest integer). Given: Molar mass of H₂O₂ is 34 g mol⁻¹ Molar volume…NVAEasyJEE 2023
  42. 42On complete combustion, 0.492 g of an organic compound gave 0.792 g of CO₂. The % of carbon in the organic compound is (Nearest integer).…NVAEasyJEE 2023
  43. 43Zinc reacts with hydrochloric acid to give hydrogen and zinc chloride. The volume of hydrogen gas produced at STP from the reaction of 11.5…NVAEasyJEE 2023
  44. 44When a hydrocarbon A undergoes complete combustion it requires 11 equivalents of oxygen and produces 4 equivalents of water. What is the…MCQEasyJEE 2023
  45. 45A sample of a metal oxide has formula M_0.83O_1.00. The metal M can exist in two oxidation states +2 and +3. In the sample of M_0.83O_1.00,…NVAMediumJEE 2023
  46. 46Assume carbon burns according to the following equation: 2C(s) + O₂(g) → 2CO(g) When 12 g of carbon is burnt in 48 g of oxygen, the volume…NVAEasyJEE 2023
  47. 47The volume of 0.02 M aqueous HBr required to neutralize 10.0 mL of 0.01 M aqueous Ba(OH)2 is (Assume complete neutralization):MCQEasyJEE 2023
  48. 480.5 g of an organic compound (X) with 60% carbon will produce × 10⁻¹ g of CO₂ on complete combustion.NVAEasyJEE 2023
  49. 49Three bulbs are filled with CH₄, CO₂, and Ne as shown in the picture. The bulbs are connected through pipes of zero volume. When the…NVAEasyJEE 2023
  50. 50In the following reactions, the total number of oxygen atoms in X and Y is: Na₂O + H₂O → 2X Cl₂O₇ + H₂O → 2YNVAEasyJEE 2023
  51. 51For the given reaction, if the initial pressure is 450 mmHg and the pressure at time t is 720 mmHg at a constant temperature T and constant…NVAEasyJEE 2023
  52. 52y mole of a hydroxy aldehyde, OHC-CH₂CH₂CH₂-CH₂OH, is treated with x mol of MeMgBr, followed by aqueous H₃O⁺ work-up, to give the diol…MCQEasyJEE 2023
  53. 53One mole of P₄ reacts with 8 moles SOCl₂ to give 4 moles of A, x mole of SO₂ and 2 moles of B. A, B and x respectively are.MCQEasyJEE 2023
  54. 54The volume of hydrogen liberated at STP by treating 2.4 g of magnesium with excess of hydrochloric acid is × 10⁻² L. Given: Molar volume of…NVAEasyJEE 2023
  55. 55A metal chloride contains 55.0% of chlorine by weight. 100 mL vapours of the metal chloride at STP weigh 0.57 g. The molecular formula of…MCQEasyJEE 2023
  56. 56In the given reaction cycle CaCl₂ + Na₂CO₃ → X + Y where X is converted back to CaCl₂ by Z. X, Y and Z respectively are:MCQMediumJEE 2023
  57. 57The mass of NH₃ produced when 131.8 kg of cyclohexanecarbaldehyde undergoes Tollens test is kg. (Nearest Integer) Given: Molar Mass of C =…NVAEasyJEE 2023

Frequently asked questions

Our bank has 57 previous-year JEE Chemistry questions tagged to Stoichiometry & Calculations, drawn from JEE papers between 2023 and 2026, including 10 from 2026 alone. Each comes with a full step-by-step solution.

Stoichiometry & Calculations is rated Intermediate overall for JEE Chemistry. The PYQs on this page break down as 45 easy, 12 medium.

Of the 57 previous-year questions on Stoichiometry & Calculations, 24 are multiple-choice (MCQ) and 33 are numerical-value (NVA) questions.

Based on recent paper analysis, Stoichiometry & Calculations is worth about 4 marks in JEE Main. It sits in Some Basic Concepts of Chemistry, a Class 11 Chemistry chapter.

More Some Basic Concepts of Chemistry topics

Mole Concept11Laws of Chemical Combination1Dalton's Atomic Theory0

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