26 JEE Main 2021 Some Basic Concepts of Chemistry previous-year questions with verified answers and step-by-step solutions.
These are the JEE Main 2021 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.
The NaNO 3 weighed out to make 50   mL of an aqueous solution containing 70 . 0   mg   Na + per mL is_ g…
A 6 . 50 molal solution of KOH aq . has a density of 1 . 89   g   cm - 3 . The molarity of the solution is mo…
Consider the complete combustion of butane, the amount of butane utilized to produce 72 . 0   g of water is ______…
Consider the above reaction where 6 . 1   g of benzoic acid is used to get 7 . 8   g of m-bromo benzoic acid.…
The formula of a gaseous hydrocarbon which requires 6 times of its own volume of O 2 for complete oxidation and produce…
Methylation of 10   g of benzene gave 9 . 2   g of toluene. Calculate the percentage yield of toluene (Neares…
100   g of propane is completely reacted with 1000   g of oxygen. The mole fraction of carbon dioxide in the…
100   mL of Na 3 PO 4 solution contains 3 . 45   g of sodium. The molarity of the solution is ..... × 10…
Complete combustion of 1 . 80   g of an oxygen containing compound C x H y O z gave 2 . 64   g of CO 2 and 1…
The number of significant figures in 0 . 00340 is _________
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