Difficulty distribution
How the classified questions are distributed by difficulty.
75questions
Not classified
75
100%
Chemistry Previous Year Questions
Practice Chemistry previous year questions organised from real papers, with year-wise coverage and clear topic navigation.
5Papers
5Years
75Questions
3Topics
Chemistry question pattern
Every graph below is calculated only from this selection.
Questions by year
Year-wise coverage for Chemistry. Each bar uses a separate theme-derived color.
Question type distribution
MCQ, numerical, multiple-select and other formats found in these papers.
75questions
Multiple Choices
75
100%
Subject weightage
Top subjects by unique question coverage.
Most asked topics
Top topics across the included previous year papers.
Subtopic coverage
Top subtopics inside this exact selection.
Paper coverage
Question coverage for the most populated papers. Every active PYP paper remains listed below.
Browse by topics
Open a focused page built from the same verified paper data.
Organic Chemistry
Explore previous-paper coverage, trends and focused practice for Organic Chemistry.
Physical Chemistry
Explore previous-paper coverage, trends and focused practice for Physical Chemistry.
Inorganic Chemistry
Explore previous-paper coverage, trends and focused practice for Inorganic Chemistry.
Included previous year papers
Newest papers appear first. Sort by year, question coverage or name.
| Paper | Year / session | Questions in this view | Open |
|---|---|---|---|
| IAT IISER 2025 | 2025 | 15 | View paper |
| IAT IISER 2024 | 2024 | 15 | View paper |
| IAT IISER 2023 | 2023 | 15 | View paper |
| IAT IISER 2022 | 2022 | 15 | View paper |
| IAT IISER 2020 | 2020 | 15 | View paper |
Sample previous year questions
A varied preview from the papers represented in this selection, with every available option.
2020 · Chemistry · Inorganic Chemistry · P Block Elements
IAT IISER 2020
Which among the following is NOT correct?
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2022 · Chemistry · Physical Chemistry · Liquid Solution
IAT IISER 2022
2 g of naphthoic acid (molecular weight $=172 \mathrm{~g} \mathrm{~mol}^{-} 1$ ) dissolved in 20 mL of benzene shows a freezing point depression of 2 K . For benzene, the freezing point depression constant, $K_f=5$ $\mathrm{K} \mathrm{kg} \mathrm{mol}{ }^{-1}$ and the density is $0.88 \mathrm{~g} \mathrm{~mL}^{-1}$. What is the magnitude of the van't Hoff factor?
2023 · Chemistry · Physical Chemistry · Thermodynamics
IAT IISER 2023
Consider the following reaction: $\mathrm{CH}_4(\mathrm{~g}) \rightarrow \mathrm{C}(\mathrm{g})+4 \mathrm{H}(\mathrm{g}) ; \Delta_a H^0=1665 \mathrm{kJmol}^{-} 1$ Which of the statements is FALSE?
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2024 · Chemistry · Inorganic Chemistry · Coordination Compounds
IAT IISER 2024
Which of the following complexes exhibit(s) magnetic moment close to 2 BM ?
\(\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]\left(\mathrm{NO}_3\right)_2, \mathrm{~K}_2\left[\mathrm{MnCl}_4\right], \mathrm{K}_4\left[\mathrm{Mn}(\mathrm{CN})_6\right] \text {, and }\left[\mathrm{Ni}(\mathrm{CO})_4\right]\)
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2025 · Chemistry · Physical Chemistry · States Of Matter
IAT IISER 2025
The work done when one mole of an ideal gas expands at constant temperature $T$ from volume $V$ to $2 V$ (in two equal steps of volume in a linear fashion) is $\frac{7}{12} R T$. How much more work would be done by the gas if it expands in three equal steps?
[ $R$ is the universal gas constant]
2020 · Chemistry · Inorganic Chemistry · Coordination Compounds
IAT IISER 2020
\(\text { The number of unpaired electron(s) in the square planar complex }[\text{Ni}(\text{CN})_4]^{2-} \text { is/are }\) :