# Chemistry CDS PYQ Topic Wise (2016–2026)

> Chemistry CDS PYQs: all 212 questions from 66 official papers (2016–2026), by concept with official answers. Asked in 11 of 11 years.

Source: https://previousyearquestions.app/cds/topics/cds-chemistry/

Explore: <a href="/cds/topics/">All CDS topics</a> · <a href="/cds/topics/general-knowledge/">CDS General Knowledge PYQs</a> · <a href="/cds/">CDS hub</a> · <a href="/cds/syllabus-pattern/">Syllabus & pattern</a> · <a href="/cds/2026/">CDS 2026</a>

## Answer first

Chemistry PYQs (previous year questions) for CDS: Chemistry (General Knowledge) had **212 questions** across the 66 official CDS papers we tagged (2016–2026), and appeared in 22 of them. Asked in 11 of 11 years. The concepts asked in the most papers: Acids and Bases, Chemical Reactions, Atomic Structure.

## Year-wise question count

<ChapterQuestions exam="cds" chapter="cds-chemistry" part="trend" />

## Most-asked concepts

Sorted by the number of papers a concept appeared in.

<ChapterQuestions exam="cds" chapter="cds-chemistry" part="concepts" />

## How to practise Chemistry PYQs

1. Start with the concepts at the top of the table. They have come back the most.
2. Solve one year's Chemistry questions from the official PDF against the clock, then check the answer listed below.
3. Log every miss as a concept gap, a calculation slip or a misread. Each needs a different fix.
4. Once a concept is clean in two papers, move to the next. Then sit a full paper from the year pages.

## Questions by year

Each line gives the question number and paper, type, concept, our one-line summary and the official answer, with a link to the official PDF.

<ChapterQuestions exam="cds" chapter="cds-chemistry" part="questions" />

## Other General Knowledge topics

- [History and Culture PYQs](/cds/topics/cds-history/)
- [Geography PYQs](/cds/topics/cds-geography/)
- [Polity PYQs](/cds/topics/cds-polity/)
- [Economy PYQs](/cds/topics/cds-economy/)
- [Physics PYQs](/cds/topics/cds-physics/)
- [Biology PYQs](/cds/topics/cds-biology/)
- [Current Affairs, Defence and Sports PYQs](/cds/topics/cds-current-affairs/)

## FAQ

### How many Chemistry questions come in CDS?
In the official papers we tagged: 20 in 2026, 21 in 2025, 22 in 2024, 19 in 2023, 16 in 2022, 20 in 2021, 19 in 2020, 18 in 2019, 18 in 2018, 21 in 2017 and 18 in 2016 (2 papers each year). That is 212 questions in all, about 8% of General Knowledge.

### Which Chemistry topics repeat in CDS?
Asked in the most papers: Acids and Bases, Chemical Reactions, Atomic Structure. The concept table lists every one with its count.

### Are these official CDS questions?
Yes. Every question is from an official CDS paper hosted on our year pages. The one-line summaries are ours; open the PDF linked beside each question for the full text.