CBSE-12-CHEM-CH1
Solutions
7 marks
Search official CBSE Class XII Chemistry paper provenance, source metadata, parsing state, and review status before anything becomes student practice. Generated-original PrepAI practice is tracked separately and must pass review before DPP, mocks, or assignments can use it.
Stop gate
Imported PYQs stay review-gated until parsing and source metadata pass.
The archive may expose source links and coordinates. It must not expose extracted stems, solution-revealing citations, rubrics, or explanations as practice content before source metadata, parsing quality, and reviewer status are complete.
Trust constraints
PrepAI shows how the study loop is constrained before asking for trust.
Source-safe
Official sources guide structure and coordinates; PrepAI content stays coordinate-based.
Deterministic tools
Chemistry calculators and paper compilation use local rules, not runtime AI guesses.
Answer-masked
Answers, explanations, and rubrics stay locked until the student commits a response.
Review-gated
Questions must pass content review before DPP, practice, assignment, or mock use.
Secure rendering
Formula rendering uses KaTeX with trust:false and unsafe math commands blocked.
Past-board source records are organized by chapter, learning outcome, marks weight, and review state. PrepAI shows source coordinates and outcome signals here, not copied PYQ text.
Estimated theory marks mapped: 0 / 70
Local-only solved checklist for mapped source references. It saves in this browser as prepai_public_pyq_checklist; no backend profile rows or answer keys are created.
CBSE-12-CHEM-CH1
CBSE-12-CHEM-CH2
CBSE-12-CHEM-CH3
CBSE-12-CHEM-CH4
CBSE-12-CHEM-CH5
Metadata-only PYQ ledger: official source coordinates, outcome mapping, and review status without copied question text.
Filter CBSE Chemistry source records by year, chapter, provenance type, and review status. Official CBSE PYQ provenance is a source record; generated-original practice is a separate PrepAI content record.
cbse-2026-class-xii-chemistry
Review status
Parsing QA pending
All Chemistry chapters
Source metadata
CBSE official question-paper portal - ZIP - 19.9 MB - SHA-256 index tracked
CBSE archive > Class XII > Chemistry > 2026
Student visibility
Source link only; imported PYQ text is not eligible for DPP, mocks, or practice yet.
Open official archivecbse-2025-comptt-class-xii-chemistry
Review status
Parsing QA pending
All Chemistry chapters
Source metadata
CBSE official question-paper portal - ZIP - 1.78 MB - SHA-256 index tracked
CBSE archive > Class XII > Chemistry > 2025-COMPTT
Student visibility
Source link only; imported PYQ text is not eligible for DPP, mocks, or practice yet.
Open official archivecbse-2025-class-xii-chemistry
Review status
Parsing QA pending
All Chemistry chapters
Source metadata
CBSE official question-paper portal - ZIP - 24.3 MB - SHA-256 index tracked
CBSE archive > Class XII > Chemistry > 2025
Student visibility
Source link only; imported PYQ text is not eligible for DPP, mocks, or practice yet.
Open official archivecbse-2024-comptt-class-xii-chemistry
Review status
Parsing QA pending
All Chemistry chapters
Source metadata
CBSE official question-paper portal - ZIP - 1.55 MB - SHA-256 index tracked
CBSE archive > Class XII > Chemistry > 2024-COMPTT
Student visibility
Source link only; imported PYQ text is not eligible for DPP, mocks, or practice yet.
Open official archivecbse-2024-class-xii-chemistry
Review status
Parsing QA pending
All Chemistry chapters
Source metadata
CBSE official question-paper portal - ZIP - 27.6 MB - SHA-256 index tracked
CBSE archive > Class XII > Chemistry > 2024
Student visibility
Source link only; imported PYQ text is not eligible for DPP, mocks, or practice yet.
Open official archivecbse-2023-comptt-class-xii-chemistry
Review status
Parsing QA pending
All Chemistry chapters
Source metadata
CBSE official question-paper portal - ZIP - 10.0 MB - SHA-256 index tracked
CBSE archive > Class XII > Chemistry > 2023-COMPTT
Student visibility
Source link only; imported PYQ text is not eligible for DPP, mocks, or practice yet.
Open official archivecbse-2023-class-xii-chemistry
Review status
Parsing QA pending
All Chemistry chapters
Source metadata
CBSE official question-paper portal - ZIP - 19.3 MB - SHA-256 index tracked
CBSE archive > Class XII > Chemistry > 2023
Student visibility
Source link only; imported PYQ text is not eligible for DPP, mocks, or practice yet.
Open official archivecbse-2022-comptt-class-xii-chemistry
Review status
Parsing QA pending
All Chemistry chapters
Source metadata
CBSE official question-paper portal - ZIP - 4.23 MB - SHA-256 index tracked
CBSE archive > Class XII > Chemistry > 2022-COMPTT
Student visibility
Source link only; imported PYQ text is not eligible for DPP, mocks, or practice yet.
Open official archivecbse-2022-class-xii-chemistry
Review status
Parsing QA pending
All Chemistry chapters
Source metadata
CBSE official question-paper portal - ZIP - 18.1 MB - SHA-256 index tracked
CBSE archive > Class XII > Chemistry > 2022
Student visibility
Source link only; imported PYQ text is not eligible for DPP, mocks, or practice yet.
Open official archiveprepai-original-solutions-colligative-v1
Review status
Student-eligible after review
Solutions
Source metadata
Outcome locator CBSE-12-CHEM-CH1 - generated-original flag true - review manifest required
Chapter 1 > Colligative properties > van't Hoff factor
Student visibility
Eligible only after content review; explanation and rubric stay masked until commit.
prepai-original-electrochem-nernst-v1
Review status
Content QA review
Electrochemistry
Source metadata
Outcome locator CBSE-12-CHEM-CH2 - misconception tags pending reviewer sign-off
Chapter 2 > Nernst equation > concentration cell reasoning
Student visibility
Not student-visible until QA review approves response, units, and rubric.
prepai-original-kinetics-first-order-v1
Review status
Student-eligible after review
Chemical Kinetics
Source metadata
Outcome locator CBSE-12-CHEM-CH3 - deterministic calculation fixture attached
Chapter 3 > Integrated rate laws > first-order half-life
Student visibility
Eligible for DPP and mocks only through approved-question selection.
Coverage: 9 official CBSE Chemistry archive links plus generated-original review examples. Official PYQ provenance records prove source coordinates; generated-original practice records prove original PrepAI item review.
The archive stores official source coordinates, file links, metadata, and review status. It does not treat extracted paper text as launch-ready student practice.
PrepAI practice items are original, outcome-tagged, misconception-tagged, and review-gated before they can appear in DPPs, assignments, or mocks.
SOURCE_INDEXED - PARSE_PENDING - QA_REVIEW - APPROVED - ELIGIBLE. Anything before approval remains source metadata only.
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