25 JEE Main 2025 Some Basic Concepts of Chemistry previous-year questions with verified answers and step-by-step solutions.
These are the JEE Main 2025 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.
Consider the above sequence of reactions. 151 g of 2-bromopentane is made to react. Yield of major product P is 80 \% w…
CaCO₃(~s)+2 HCl(aq) → CaCl₂(aq)+CO₂(~g) H₂ O(l) Consider the above reaction, what mass of CaCl₂ will be formed if 250 m…
When 81.0 g of aluminium is allowed to react with 128.0 g of oxygen gas, the mass of aluminium oxide produced in grams…
Mass of magnesium required to produce 220 mL of hydrogen gas at STP on reaction with excess of dil. HCl is Given : Mola…
Density of 3 M NaCl solution is 1.25 ~g / mL. The molality of the solution is :
On combustion 0.210 g of an orgainc compound containing C, H and O gave 0.127 ~g H₂ O and 0.307 g CO₂. The percentages…
Concentrated nitric acid is labelled as 75 \% by mass. The volume in mL of the solution which contains 30 g of nitric a…
Quantitative analysis of an organic compound (X) shows following % composition. C : 14.5 \% Cl : 64.46% H: 1.8 % (Empir…
20 mL of sodium iodide solution gave 4.74 g silver iodide when treated with excess of silver nitrate solution. The mola…
Among 10⁻⁹ ~g (each) of the following elements, which one will have the highest number of atoms? Element : Pb, Po, Pr a…
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