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General Principles of Isolation of Elements PYQs (previous year questions) for CBSE Class 12: General Principles of Isolation of Elements (Chemistry) had 6 questions across the 50 official CBSE Class 12 papers we tagged (2016–2026), and appeared in 5 of them. Asked in 5 of 10 years; last in 2020. The concepts asked in the most papers: Extraction of Metals, Leaching, Refining and Extraction.
Year-wise question count
Asked in 5 of 10 years.
| Year | Questions |
|---|---|
| CBSE Class 12 2026 | Not asked |
| CBSE Class 12 2025 | Not asked |
| CBSE Class 12 2024 | Not asked |
| CBSE Class 12 2023 | Not asked |
| CBSE Class 12 2022 | Not asked |
| CBSE Class 12 2020 | 2 |
| CBSE Class 12 2019 | 1 |
| CBSE Class 12 2018 | 1 |
| CBSE Class 12 2017 | 1 |
| CBSE Class 12 2016 | 1 |
Most-asked concepts
Sorted by the number of papers a concept appeared in.
| Concept | Questions | Papers | Years |
|---|---|---|---|
| Extraction of Metals | 3 | 3 | 2020, 2018, 2016 |
| Leaching | 1 | 1 | 2020 |
| Refining and Extraction | 1 | 1 | 2019 |
| Refining Methods | 1 | 1 | 2017 |
How to practise General Principles of Isolation of Elements PYQs
- Start with the concepts at the top of the table. They have come back the most.
- Solve one year’s General Principles of Isolation of Elements questions from the official PDF against the clock, then check the answer listed below.
- Log every miss as a concept gap, a calculation slip or a misread. Each needs a different fix.
- 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, with a link to the official PDF.
CBSE Class 122020
CBSE Class 122019
- Q.17 (Chemistry (56/1/1)) · Short answer · Refining and Extraction: Refining for semiconductors and volatile metals; copper from Cu2S PDF
CBSE Class 122018
- Q.15 (Chemistry (56/1)) · Short answer · Extraction of Metals: Reactions in gold extraction and roles of NaCN and zinc PDF
CBSE Class 122017
- Q.17 (Chemistry (56/1)) · Short answer · Refining Methods: Principles of zone refining, froth floatation and chromatography PDF
CBSE Class 122016
- Q.14 (Chemistry (56/1/N)) · Short answer · Extraction of Metals: Adsorption-based refining, depressant role, limestone in iron extraction PDF
Other Chemistry chapters
- The Solid State PYQs
- Solutions PYQs
- Electrochemistry PYQs
- Chemical Kinetics PYQs
- Surface Chemistry PYQs
- The p-Block Elements PYQs
- The d- and f-Block Elements PYQs
- Coordination Compounds PYQs
- Haloalkanes and Haloarenes PYQs
- Alcohols, Phenols and Ethers PYQs
- Aldehydes, Ketones and Carboxylic Acids PYQs
- Amines PYQs
- Biomolecules PYQs
- Polymers PYQs
- Chemistry in Everyday Life PYQs
FAQ
How many General Principles of Isolation of Elements questions come in CBSE Class 12?
In the official papers we tagged: 2 in 2020, 1 in 2019, 1 in 2018, 1 in 2017 and 1 in 2016. Not asked in the other 5 years. That is 6 questions in all, about 2% of Chemistry.
Which General Principles of Isolation of Elements topics repeat in CBSE Class 12?
Asked in the most papers: Extraction of Metals, Leaching, Refining and Extraction. The concept table lists every one with its count.
Are these official CBSE Class 12 questions?
Yes. Every question is from an official CBSE Class 12 paper hosted on our year pages. The one-line summaries are ours; open the PDF linked beside each question for the full text.