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Chemistry - Some Basic Concepts of Chemistry

Practise 21 JEE Advanced previous year questions on Some Basic Concepts of Chemistry, compiled from papers spanning 2007 to 2024. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty JEE Advanced tests.

Some Basic Concepts of Chemistry has been asked in 13 of the 27 years of JEE Advanced papers analysed (2000–2026), with 21 questions in all. 24% of them were easy, 67% moderate and 10% tough. Most of its questions came from 2021, with 4 questions that year. In the last three years (2024–2026) it had 1 question across 6 papers, about 0.2 per paper.

The chapter's 5 topics are not weighted equally: Mole concept (7 questions, 33%), Quantitative measures in chemical equations (5 questions, 24%), and Concentration terms (4 questions, 19%) have been asked the most. Over the last five years the most frequent topics have been Laws of chemical combination (2) and Mole concept (1). Quantitative measures in chemical equations has produced the most tough questions (1).

  1. 1To form a complete monolayer of acetic acid on of charcoal, of acetic acid was used. Some of the acetic acid remained unadsorbed. To neutral2024 (Paper 2)Mole concept
  2. 2The treatment of an aqueous solution of 3 . 74 g of Cu NO 3 2 with excess KI results in a brown solution along with the formation of a preci2022 (Paper 1)Laws of chemical combination
  3. 3To check the principle of multiple proportions, a series of pure binary compounds P m Q n were analysed and their composition is tabulated b2022 (Paper 2)Laws of chemical combination
  4. 4For the following reaction scheme, percentage yields are given along the arrow: and are mass of and , respectively. (Use: Molar mass (in ) o2021 (Paper 1)Quantitative measures in chemical equations
  5. 5For the following reaction scheme, percentage yields are given along the arrow: and are mass of and , respectively. (Use: Molar mass (in ) o2021 (Paper 1)Quantitative measures in chemical equations
  6. 6Reaction of g of with quantitatively produced a salt. Entire amount of the salt reacted with of nitrobenzene in the presence of required amo2021 (Paper 2)Laws of chemical combination
  7. 7Reaction of g of with quantitatively produced a salt. Entire amount of the salt reacted with of nitrobenzene in the presence of required amo2021 (Paper 2)Laws of chemical combination
  8. 8Aluminium reacts with sulfuric acid to form aluminium sulfate and hydrogen. What is the volume of hydrogen gas in liters ( L ) produced at 32020 (Paper 1)Mole concept
  9. 9Consider the reaction sequence from P to Q shown below. The overall yield of the major product Q from P 75 % . What is the amount in grams o2020 (Paper 2)Quantitative measures in chemical equations
  10. 10The mole fraction of urea in an aqueous urea solution containing 900 g of water is 0.05 . If the density of the solution is 1.2 g c m - 3 , 2019 (Paper 2)Concentration terms
  11. 11The ammonia is prepared by treating ammonium sulphate with calcium hydroxide is completely used by NiCl 2 6 H 2 O to form a stable coordinat2018 (Paper 1)Mole concept
  12. 12Galena (an ore) is partially oxidized by passing air through it at high temperature. After some time, the passage of air is stopped, but the2018 (Paper 2)Mole concept
  13. 13In the following reaction sequence, the amount of D (in g) formed from 10 moles of acetophenone is ____. (Atomic weights in g m o l - 1 : H 2018 (Paper 2)Quantitative measures in chemical equations
  14. 14The mole fraction of a solute in a solution is 0 . 1 . At 298 K , the molarity of this solution is the same as its molality. The density of 2016 (Paper 1)Concentration terms
  15. 15The % yield of ammonia as a function of time in the reaction N 2 g + 3 H 2 g ⇌ 2 N H 3 g , Δ H 0 at ( P , T 1 ) is given below. If this reac2015 (Paper 1)Quantitative measures in chemical equations
  16. 16A compound H 2 X with molar weight of 80g is dissolved in a solvent having density of 0.4 g m l 1 . Assuming no change in volume upon dissol2014 (Paper 1)Concentration terms
  17. 17stock solution has a density of . The molecular weight of is . The volume of stock solution required to prepare a 200 solution of is :2012 (Paper 1)Mole concept
  18. 18Dissolving of urea (molecular weight 60) in of water gave a solution of density . The molarity of the solution is2011 (Paper 1)Concentration terms
  19. 19A student performs a titration with different burettes and finds titre values of , and . The number of significant figures in the average ti2010 (Paper 1)Significant Figures
  20. 20Paragraph: Chemical reactions involve interaction of atoms and molecules. A large number of atoms/molecules (approximately ) are present in 2007 (Paper 1)Mole concept
  21. 21Paragraph: Chemical reactions involve interaction of atoms and molecules. A large number of atoms/molecules (approximately ) are present in 2007 (Paper 1)Mole concept

Frequently Asked Questions

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

This chapter includes 21 questions compiled from JEE Advanced papers spanning 2007 to 2024.

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

These are JEE Advanced 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 JEE Advanced Chemistry?

Some Basic Concepts of Chemistry has appeared in 13 of the 21 years of JEE Advanced papers covered here, with 21 questions across 17 papers - about one per paper it appears in.

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

Of the 21 questions analysed for this chapter, 24% are easy, 67% moderate and 10% tough. 2021 had the most, with 4 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 - 7 questions (33%)
  • Quantitative measures in chemical equations - 5 questions (24%)
  • Concentration terms - 4 questions (19%)
  • Quantitative measures in chemical equations has produced the most tough questions (1).
6.Is Some Basic Concepts of Chemistry's weightage in JEE Advanced going up or down?

Across all 17 papers analysed, Some Basic Concepts of Chemistry has averaged about 1.2 questions per paper. In the last three years (2024–2026), that average has fallen, at about 0.2 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.