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Chemistry - Some Basic Concepts of Chemistry

Practise 45 COMEDK previous year questions on Some Basic Concepts of Chemistry, compiled from papers spanning 2012 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty COMEDK tests.

Some Basic Concepts of Chemistry has been asked in 14 of the 15 years of COMEDK papers analysed (2012–2026), with 45 questions in all. 22% of them were easy, 69% moderate and 9% tough. Most of its questions came from 2024, with 7 questions that year. In the last three years (2024–2026) it had 13 questions across 9 papers, about 1.4 per paper.

The chapter's 4 topics are not weighted equally: Mole concept (18 questions, 40%), Quantitative measures in chemical equations (13 questions, 29%), and Concentration terms (12 questions, 27%) have been asked the most. Mole concept has also led over the last five years, with 7 questions. Mole concept has produced the most tough questions (2).

  1. 1The mass of precipitate formed when 50 mL of 16.9% aqueous solution of is mixed with 50 mL of 5.8% NaCl solution is------------g [Ag = 107.809 May, 2026 (S1)Quantitative measures in chemical equations
  2. 2How many molecules of CO (g) are obtained on reaction of 24 grams of methane with 4moles of oxygen?09 May, 2026 (S2)Quantitative measures in chemical equations
  3. 3500 mL of an aqueous solution of glucose C H O (Molar mass 180 gmol ) contains molecules. The concentration of the solution will be:09 May, 2026 (S2)Mole concept
  4. 420 g of is made to react with 5 g of to give ammonia. The limiting reagent and number of moles of formed respectively are:25 May, 2025 (Shift)Mole concept
  5. 5If X is a haloalkane with a single Chlorine atom per molecule and the percentage of Cl is 55 , what would be the number of Cl atoms present 10 May, 2025 (S1)Mole concept
  6. 6When one mole of a hydrocarbon undergoes complete combustion, it requires 7.5 moles of and results in the production of 6 moles of . Calcula10 May, 2025 (S2)Quantitative measures in chemical equations
  7. 7When 1 mole of and 1 mole of ammonia are made to react in the reaction,2024 (Afternoon Shift)Quantitative measures in chemical equations
  8. 8What mass of Silver chloride, in grams, gets precipitated when of solution of Silver nitrate is reacted with of Sodium chloride solution? At2024 (Evening Shift)Mole concept
  9. 91.12 mL of gas is produced at STP by the action of 4.12 mg of alcohol, ROH , methyl magnesium iodide. The molecular mass of alcohol is2024 (Memory Based)Mole concept
  10. 10An aqueous KCl solution of density has a molality of . The molarity of solution in is .... (Nearest integer) [Molar mass of ]2024 (Memory Based)Concentration terms
  11. 11In a closed vessel, 5 moles of and 7 moles of are reacted in following manner. What is the total number of moles of the gases present in the2024 (Memory Based)Mole concept
  12. 12Nitrogen forms five stable oxides with oxygen of the formula and . The formation of these oxides explains fully the2024 (Memory Based)Laws of chemical combination
  13. 13A given mass of a hydrocarbon on complete combustion produced of and of . What is the Molecular formula of the compound?2024 (Morning Shift)Mole concept
  14. 14is used as an antacid. If a person, suffering from acidity, produces of Gastric juice in a day, approximately how many antacid tablets, each2023 (Evening Shift)Quantitative measures in chemical equations
  15. 15of completely reacts with2023 (Memory Based)Quantitative measures in chemical equations
  16. 16of completely reacts with2023 (Morning Shift)Quantitative measures in chemical equations
  17. 17What would be the molarity of one litre solution of of ?2021Concentration terms
  18. 18The number of gram molecules of chlorine in hydrogen chloride molecules is2020Mole concept
  19. 19Which one of the following has maximum number of atoms of oxygen?2020Mole concept
  20. 20Molarity of a given orthophosphoric acid solution is . It's normality is2020Concentration terms
  21. 21Gram molecular volume of oxygen at STP is2020Mole concept
  22. 22The mass of a metal, with equivalent mass , which would combine with of oxygen is2020Laws of chemical combination
  23. 23of sucrose is dissolved in of water. The molality of the solution is2019Concentration terms
  24. 24The mass of glucose to be dissolved in of water to get molal solution is2019Concentration terms
  25. 25The decomposition of a certain mass of gave of gas at . The mass of required to completely neutralise the gas is2018Quantitative measures in chemical equations
  26. 264 moles each of and gases are allowed to react to form in a closed vessel. At equilibrium of is used up. The total number of moles of all th2018Quantitative measures in chemical equations
  27. 27The formula mass of Mohr's salt is . The iron present in it is oxidised by in acid medium. The equivalent mass of Mohr's salt is2018Concentration terms
  28. 28of monobasic acid requires of sodium hydroxide solution whose normality is2017Concentration terms
  29. 29Mass of mole of methane is2017Mole concept
  30. 30For the reaction, , the volume of carbon monoxide required to reduce one mole of ferric oxide is2017Quantitative measures in chemical equations
  31. 31Three moles of , three moles of and two moles of are taken in a closed vessel. If at equilibrium the vessel has moles of , the number of mol2017Quantitative measures in chemical equations
  32. 32of oxygen contains as many atoms as in2017Mole concept
  33. 33A solution contains hydrochloric acid molecules in one of the solution. The strength of the solution is2016Concentration terms
  34. 34of acetic acid reacts with of ethyl alcohol to form ethyl acetate. The density of acid and alcohol are and respectively. The limiting reagen2015Quantitative measures in chemical equations
  35. 35The mass of oxygen gas which occupies at STP would be2015Mole concept
  36. 36Density of solution of is . The mass of the solvent in the solution is2014Concentration terms
  37. 37When the concentration is expressed as the number of moles of solute per kilogram of the solvent, it is known as2014Concentration terms
  38. 38A signature, written in carbon pencil weighs . What is the number of carbon atoms present in the signature?2013Mole concept
  39. 39The volume of water to be added to to prepare of solution is2013Concentration terms
  40. 40What is the volume of ' volume ' required to get of oxygen at STP?2013Mole concept
  41. 41The mole fraction of benzene in a solution containing by mass in an organic solvent of molecular mass 122 is2012Concentration terms
  42. 42Number of atoms in of oxygen at STP is2012Mole concept
  43. 43The volume of liberated at STP, when of anhydrous sodium carbonate is treated with excess of dilute is [atomic mass of2012Quantitative measures in chemical equations
  44. 44of was added to of pure . What would remain after the reaction?2012Mole concept
  45. 45The mass of hydrogen in gram required to completely saturate 1 mole of triolein is2012Mole concept

Frequently Asked Questions

1.How many questions are available for Some Basic Concepts of Chemistry?

This chapter includes 45 questions compiled from COMEDK papers spanning 2012 to 2026.

2.Are these questions only from COMEDK, or from other exams too?

These are COMEDK questions specifically for the Some Basic Concepts of Chemistry chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.

3.Is Some Basic Concepts of Chemistry an important chapter for COMEDK Chemistry?

Some Basic Concepts of Chemistry has appeared in 14 of the 15 years of COMEDK papers covered here, with 45 questions across 22 papers - about 2 per paper it appears in.

4.What is the difficulty level of Some Basic Concepts of Chemistry questions in COMEDK?

Of the 45 questions analysed for this chapter, 22% are easy, 69% moderate and 9% tough. 2024 had the most, with 7 questions.

5.Which topics in Some Basic Concepts of Chemistry should I focus on?

These topics have carried the most weightage in Some Basic Concepts of Chemistry:

  • Mole concept - 18 questions (40%)
  • Quantitative measures in chemical equations - 13 questions (29%)
  • Concentration terms - 12 questions (27%)
  • Mole concept has produced the most tough questions (2).
6.Is Some Basic Concepts of Chemistry's weightage in COMEDK going up or down?

Across all 22 papers analysed, Some Basic Concepts of Chemistry has averaged about 2.0 questions per paper. In the last three years (2024–2026), that average has fallen, at about 1.4 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.