14 JEE Main 2026 Some Basic Concepts of Chemistry previous-year questions with verified answers and step-by-step solutions.
These are the JEE Main 2026 previous-year questions from the Some Basic Concepts of Chemistry chapter of Chemistry. Each links to a full solution with a verified answer key. To see the whole chapter across all years, visit the Some Basic Concepts of Chemistry chapter hub.
Number of moles and number of molecules in 1.4187 L of SO₂ at STP respectively are:
80 mL of a hydrocarbon on mixing with 264 mL of oxygen in a closed U-tube undergoes complete combustion. The residual g…
14.0 g of calcium metal is allowed to react with excess HCl at 1.0 atm pressure and 273 K. Which of the following state…
For the given reaction: CaCO₃+2 HCl CaCl₂+H₂ O+CO₂ If 90 ~g CaCO₃ is added to 300 mL of HCl which contains 38.55 \% HCl…
Match List-I with List-II. List-I Mass of substance List-II Number of atoms A. 1.8 mg water I. 2× 10⁻⁴× NA B. 9.8 mg su…
The correct order of total number of atoms present in (A) 2 moles of cyclohexane (B) 684 g of sucrose (C) 90.8 L of dih…
How many grams of residue is obtained by heating 2.76 g of silver carbonate? (Given: Molar mass of C, O and Ag are 12,…
Which of the following contain the same number of atoms ? (Given : Molar mass in g mol⁻¹ of H, He, O and S are 1, 4, 16…
What volume of hydrogen gas at STP would be liberated by action of 50 mL of H₂SO₄ of 50\% purity (density = 1.3 g mL⁻¹)…
The ratio of mass percentage (w/w) of C : H in a hydrocarbon is 12 : 1. It has two carbon atoms. The weight (in g) of C…
Log in to unlock the full list, track what you've solved, and practice on the TCS iON-style CBT player. It's free.