Difficulty distribution
How the classified questions are distributed by difficulty.
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Practice Some Basic Concepts Of Chemistry - Physical Chemistry - Chemistry previous year questions organised from real papers, with year-wise coverage and clear topic navigation.
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Year-wise coverage for Some Basic Concepts Of Chemistry. Each bar uses a separate theme-derived color.
How the classified questions are distributed by difficulty.
MCQ, numerical, multiple-select and other formats found in these papers.
Top subjects by unique question coverage.
Top topics across the included previous year papers.
Top subtopics inside this exact selection.
Question coverage for the most populated papers. Every active PYP paper remains listed below.
Newest papers appear first. Sort by year, question coverage or name.
| Paper | Year / session | Questions in this view | Open |
|---|---|---|---|
| COMEDK 2025 EVENING SHIFT | 2025 | 1 | View paper |
| COMEDK 2025 Morning Shift | 2025 | 1 | View paper |
| COMEDK 2024 AFTERNOON SHIFT | 2024 | 1 | View paper |
| COMEDK 2024 EVENING SHIFT | 2024 | 2 | View paper |
| COMEDK 2024 MORNING SHIFT | 2024 | 1 | View paper |
| COMEDK 2023 EVENING SHIFT | 2023 | 1 | View paper |
| COMEDK 2023 Morning Shift | 2023 | 1 | View paper |
| COMEDK 2021 | 2021 | 1 | View paper |
| COMEDK 2020 | 2020 | 4 | View paper |
Practice every matching question in batches of 20, with every available option.
Which one of the following has maximum number of atoms of oxygen?
The number of gram molecules of chlorine in \(6.02\times10^{25}\) hydrogen chloride molecules is
The mass of a metal, with equivalent mass 31.75, which would combine with 8 g of oxygen is
Molarity of a given orthophosphoric acid solution is 3M. It’s normality is
What would be the molarity of one litre solution of 22.2 g of CaCl\(_2\) ?
\(\mathrm{Mg}(\mathrm{OH})_2\) is used as an antacid. If a person, suffering from acidity, produces \(2.5 \mathrm{~L}\) of Gastric juice in a day, approximately how many antacid tablets, each containing \(600 \mathrm{~mg}\) of \(\mathrm{Mg}(\mathrm{OH})_2\), will be required to completely neutralise the whole \(\mathrm{HCl}\) produced in the stomach in one day? (Gastric juice contains \(3.0 \mathrm{~g}\) of \(\mathrm{HCl}\) per L). (Atomic masses: \(\mathrm{Mg}=24 \mathrm{~g} / \mathrm{mol}, \mathrm{O}=16 \mathrm{~g} / \mathrm{mol}\) & \(\mathrm{H}=1 \mathrm{~g} / \mathrm{mol}\).)
When 1 mole of \(\mathrm{O}_2\) and 1 mole of ammonia are made to react in the reaction,
$$4 \mathrm{NH}_3(\mathrm{~g})+5 \mathrm{O}_2(\mathrm{~g}) \rightarrow 4 \mathrm{NO}(\mathrm{g})+6 \mathrm{H}_2 \mathrm{O}(\mathrm{g})$$
What mass of Silver chloride, in grams, gets precipitated when \(150 \mathrm{~ml}\) of \(32 \%\) solution of Silver nitrate is reacted with \(150 \mathrm{ml}\) of \(11 \%\) Sodium chloride solution? Atomic mass in \(\mathrm{g} / \mathrm{mol}: \mathrm{Ag}=108, \mathrm{Na}=23, \mathrm{Cl}=35.5, \mathrm{~N}=14, \mathrm{O}=16\)
Sulphuric acid used in Lead Storage battery has a concentration of \(4.5 \mathrm{~M}\) and a density of \(1.28 \mathrm{~g} / \mathrm{~ml}\). The molality of the acid is __________.
A given mass of a hydrocarbon on complete combustion produced \(176 \mathrm{~g}\) of \(\mathrm{CO}_2\) and \(90 \mathrm{~g}\) of \(\mathrm{H}_2 \mathrm{O}\). What is the Molecular formula of the compound?
\(15 \mathrm{~g}\) of \(\mathrm{CaCO}_3\) completely reacts with