12 JEE Main 2019 Some Basic Concepts of Chemistry previous-year questions with verified answers and step-by-step solutions.
These are the JEE Main 2019 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.
8   g of NaOH is dissolved in 18 g of H 2 O . Mole fraction of NaOH in solution and molality (in   mol  …
For a reaction, N 2 g + 3 H 2 ( g ) ⟶ 2 N H 3 ( g ) , identify di-hydrogen ( H 2 ) as a limiting reagent in the…
25   g of an unknown hydrocarbon upon burnig produces 88   g of C O 2 and 9 g of H 2 O . This unknown hydroca…
For the following reaction, the mass of water produced from 445   g   of C 57 H 110 O 6 is: 2   C 57 H 1…
At 300   K and 1 atmospheric pressure, 10   m L of a hydrocarbon required 55   m L   of O 2 for com…
25 ~mL of the given HCl solution requires 30 ~mL of 0.1 M sodium carbonate solution. What is the volume of this HCl sol…
What would be the molality of 20% (mass/mass) aqueous solution of K I ? (molar mass of K I = 166   g   m o l…
A 10 mg effervescent tablet containing sodium bicarbonate and oxalic acid releases 0.25 ~mL of CO₂ at T=298.15 ~K and P…
0.27   g of a long chain fatty acid was dissolved in 100   c m 3 of hexane. 10   m L   of this solu…
The percentage composition of carbon by mole in methane is:
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