Original revision introduction and starter practice. Full learning texts are available through the publisher links below. This guide is not a CBSE-issued solution manual.
Revision introduction
Balance a chemical equation by changing coefficients, never chemical formulae. A balanced equation conserves atoms of each element. Oxidation can involve addition of oxygen or removal of hydrogen; reduction reverses these changes. Distinguish a chemical change, which forms new substances, from a physical change.
Curriculum navigation
Chemical Reactions and Equations
Acids, Bases and Salts
Metals and Non-metals
Carbon and its Compounds
Life Processes
Control and Coordination
How do Organisms Reproduce?
Heredity
Light – Reflection and Refraction
The Human Eye and the Colourful World
Electricity
Magnetic Effects of Electric Current
Our Environment
Consult the current official syllabus for examinable sections, project-only content, practicals, prescribed texts and exclusions. A unit index does not override those boundaries.
Original practice
Which coefficients balance H₂+O₂→H₂O?
2,1,2
1,1,1
1,2,1
2,2,1
Worked answer
2,1,2
2H₂+O₂→2H₂O gives four hydrogen atoms and two oxygen atoms on both sides.
Full publisher materials and answer resources
CBSE 10 Science · syllabus · CBSE · 2026-27 The current official syllabus defines examinable content, internal assessment, practicals and prescribed books. Unit names in the app are a navigation index; consult this document for exclusions and assessment boundaries.
NCERT · Science · NCERT · 2026-27 Official book selector with chapter PDFs and complete-book download. A textbook may contain material outside the assessed syllabus; follow the linked current syllabus.
NCERT Exemplar Problems and Answers · NCERT · Archive · map to 2026-27 Select Class 10 and the subject. The official portal includes answer sections. Older exemplars require checking each question against the current syllabus.
KVS student support material · Class 10 · Kendriya Vidyalaya Sangathan · 2026-27 Use the 2026–27 support-material folders linked by the school. These are KVS teaching/revision resources, not CBSE official marking schemes. Subject availability varies; older packs must be mapped to the current syllabus.
CBSE 2026–27 · Sample question paper · CBSE · 2026-27 Official document listed by CBSE for 2026–27. Open at the publisher; no third-party solutions are represented as official. Sample papers are practice models, not previous board examination papers.
CBSE 2026–27 · Official marking scheme / answer key · CBSE · 2026-27 Official document listed by CBSE for 2026–27. Open at the publisher; no third-party solutions are represented as official. Sample papers are practice models, not previous board examination papers.
NCERT laboratory manuals · NCERT · Reference · map to 2026-27 Select the class and subject. Use the practical list in the current CBSE syllabus; experiments require teacher supervision.
DIKSHA · curriculum learning resources · Ministry of Education / DIKSHA · Current portal Choose CBSE/NCERT, Class 10, subject and medium. This is a searchable portal, not a promise of a specific playable lesson.