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Chemistry - Some Basic Concepts of Chemistry

Practise 154 MHTCET previous year questions on Some Basic Concepts of Chemistry, compiled from papers spanning 2009 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 MHTCET tests.

Some Basic Concepts of Chemistry has been asked in 14 of the 17 years of MHTCET papers analysed (2007–2026), with 154 questions in all. 57% of them were easy, 42% moderate and 1% tough. Most of its questions came from 2020, with 28 questions that year. In the last three years (2024–2026) it had 61 questions across 59 papers, about 1 per paper.

The chapter's 5 topics are not weighted equally: Mole concept (84 questions, 55%), Quantitative measures in chemical equations (25 questions, 16%), and Concentration terms (24 questions, 16%) have been asked the most. Mole concept has also led over the last five years, with 63 questions. Quantitative measures in chemical equations has produced the most tough questions (1).

  1. 1What is the SI unit of luminous intensity ?20 Apr, 2026 (M)Significant Figures
  2. 2What is average atomic mass of chlorine if its two isotopes and exists in relative abundance of and respectively ?20 Apr, 2026 (M)Mole concept
  3. 3What is the number of molecules in 2.125 g of ammonia?20 Apr, 2026 (E)Mole concept
  4. 4What quantity of in gram is present in mol of it?19 Apr, 2026 (M)Mole concept
  5. 5What is the percentage atom economy when formula weight of product is u and the sum of formula weight of reactant is u?19 Apr, 2026 (M)Quantitative measures in chemical equations
  6. 6Chlorine has two isotopes and with percentage abundance of and respectively. Find average atomic mass of chlorine ?19 Apr, 2026 (E)Mole concept
  7. 7How many moles of potassium chlorate are heated to produce of oxygen at STP ?18 Apr, 2026 (M)Mole concept
  8. 8Find the number of molecules present in 70 g dinitrogen.18 Apr, 2026 (E)Mole concept
  9. 9Calculate the number of molecules present in 2.24 of carbon dioxide at STP ?17 Apr, 2026 (M)Mole concept
  10. 10How many moles of potassium chlorate are heated to produce L oxygen at STP ?17 Apr, 2026 (E)Mole concept
  11. 11Calculate the amount of aluminium present in if the compound contains 4 g of sulfur. [Molar mass of sulfur = 32 g/mol , Molar mass of Al =2716 Apr, 2026 (M)Mole concept
  12. 12The ratio of mass of 'x' atoms of an element to mass of carbon atoms is 9:1. Find the mass of 1 mol of x if molar mass of carbon is 12 g/mol16 Apr, 2026 (E)Mole concept
  13. 13What is the approximate mass of the precipitate formed when mL of solution of is mixed with mL of KCl solution? (Molar mass of g/mol, KCl g/15 Apr, 2026 (M)Quantitative measures in chemical equations
  14. 14What is number of hydrogen molecules needed to synthesize 3.4 g of ammonia by reaction with nitrogen?15 Apr, 2026 (E)Quantitative measures in chemical equations
  15. 15Find the mass of sodium carbonate in grams to form 100 ml 0.1 M solution in water? ( Molar mass of = 106 g/mol)15 Apr, 2026 (E)Mole concept
  16. 16Which of the following contains maximum number of molecules?13 Apr, 2026 (M)Mole concept
  17. 17g of contains the same number of molecules as in13 Apr, 2026 (E)Mole concept
  18. 18Calculate the mass of molecules of oxygen in amu and in grams.11 Apr, 2026 (M)Mole concept
  19. 19Calculate the volume of g of at STP ?11 Apr, 2026 (E)Mole concept
  20. 20What is the number of hydrogen atoms present in 5.4 g of urea?05 May, 2025 (E)Mole concept
  21. 21Calculate mass of 0.25 mole of iron (molar mass )27 Apr, 2025 (E)Mole concept
  22. 22Find out the total number of electrons present in 3.2 g methane?26 Apr, 2025 (M)Mole concept
  23. 23Calculate number of molecules present in 5.4 g of urea (Molar mass of urea )26 Apr, 2025 (E)Mole concept
  24. 24The vapour density of a certain gas is 16. What is the volume occupied by 8 g of gas at STP assuming ideal behaviour?25 Apr, 2025 (M)Quantitative measures in chemical equations
  25. 25Find out total number of electrons present in 1.6 g methane?25 Apr, 2025 (M)Mole concept
  26. 26Find the volume of 56 g dinitrogen at STP25 Apr, 2025 (E)Mole concept
  27. 27What is the number of moles present in of any gas at STP?23 Apr, 2025 (M)Mole concept
  28. 28Find the number of millimoles for 0.160 g sodium hydroxide.23 Apr, 2025 (E)Mole concept
  29. 29Calculate the number of ions in 222 g unhydrous calcium chloride ? (At. mass )22 Apr, 2025 (M)Mole concept
  30. 30What is vapour density of gas?22 Apr, 2025 (M)Quantitative measures in chemical equations
  31. 31A gaseous mixture of and are in the ratio by mass. Find the ratio of their molecules.22 Apr, 2025 (E)Mole concept
  32. 32What is the difference in molar masses of Undecane and Decane?22 Apr, 2025 (E)Mole concept
  33. 33Find the number of water molecules in 1 mL of water vapours at STP?22 Apr, 2025 (E)Mole concept
  34. 34Find the number of moles present in 0.448 L of dihydrogen at STP.21 Apr, 2025 (M)Mole concept
  35. 35The mass of of certain gas is 5.6 g at STP. Assuming ideal behaviour, identify the probable gas from following.21 Apr, 2025 (E)Mole concept
  36. 36Calculate the number of ion in 222 g anhydrous calcium chloride? (At. mass )21 Apr, 2025 (E)Mole concept
  37. 37What is the mass in grams of 0.25 mol water?20 Apr, 2025 (M)Mole concept
  38. 38What is the volume occupied by 0.5 mol of at STP?19 Apr, 2025 (M)Mole concept
  39. 39In a chemical reaction, sum of formula weight of all reactants is 274 u and atom economy is , calculate formula weight of desired product?19 Apr, 2025 (M)Quantitative measures in chemical equations
  40. 40Find the mass of potassium chloride required to liberate of oxygen gas at STP ? (molar mass of )19 Apr, 2025 (E)Mole concept
  41. 41Find the number of moles of sodium atoms in Atomic mass16 May, 2024 (M)Mole concept
  42. 42Calculate mass in kg of 2.5 mole ammonia.16 May, 2024 (E)Mole concept
  43. 43What is the percentage by mass of oxygen in NaOH ? (Atomic mass of )15 May, 2024 (M)Concentration terms
  44. 44What is value of percent atom economy when reactants having sum of formula weight 78 u results in the formation of a product with formula we15 May, 2024 (M)Concentration terms
  45. 45What is the number of moles of water molecules present in a mole of carnallite?15 May, 2024 (M)Mole concept
  46. 46What is the volume occupied by 2.5 mol of ammonia gas at STP?15 May, 2024 (E)Quantitative measures in chemical equations
  47. 47Which of the following pair of compounds cannot demonstrate law of multiple proportion?11 May, 2024 (M)Laws of chemical combination
  48. 48How many molecules of carbon dioxide are formed when 0.6 g carbon is burnt in air?11 May, 2024 (E)Mole concept
  49. 49What is the volume of oxygen required for complete combustion of 0.25 mole of methane at S.T.P.?10 May, 2024 (M)Quantitative measures in chemical equations
  50. 50Chlorine exists in two isotopic forms . If average atomic mass of chlorine is 35.5 , what is the percentage abundance of these isotopes resp10 May, 2024 (M)Mole concept

Frequently Asked Questions

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

This chapter includes 154 questions compiled from MHTCET papers spanning 2009 to 2026.

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

These are MHTCET 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 MHTCET Chemistry?

Some Basic Concepts of Chemistry has appeared in 14 of the 17 years of MHTCET papers covered here, with 154 questions across 96 papers - about 2 per paper it appears in.

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

Of the 154 questions analysed for this chapter, 57% are easy, 42% moderate and 1% tough. 2020 had the most, with 28 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 - 84 questions (55%)
  • Quantitative measures in chemical equations - 25 questions (16%)
  • Concentration terms - 24 questions (16%)
  • Quantitative measures in chemical equations has produced the most tough questions (1).
6.Is Some Basic Concepts of Chemistry's weightage in MHTCET going up or down?

Across all 96 papers analysed, Some Basic Concepts of Chemistry has averaged about 1.6 questions per paper. In the last three years (2024–2026), that average has fallen, at about 1.0 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.