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
Concentration can be expressed as molarity or molality. Molarity is moles of solute per litre of solution; molality is moles per kilogram of solvent. Molarity depends on temperature through volume. Raoult’s law describes ideal solution vapour pressure; deviations reflect differences in intermolecular interactions.
Curriculum navigation
Solutions
Electrochemistry
Chemical Kinetics
d- and f-Block Elements
Coordination Compounds
Haloalkanes and Haloarenes
Alcohols, Phenols and Ethers
Aldehydes, Ketones and Carboxylic Acids
Amines
Biomolecules
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
What is the molarity of 0.5 mol dissolved to make 2 L of solution?
0.25 mol/L
1 mol/L
4 mol/L
2.5 mol/L
Worked answer
0.25 mol/L
M=n/V=0.5/2=0.25 mol/L.
Full publisher materials and answer resources
CBSE 12 Chemistry · 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 Exemplar Problems and Answers · NCERT · Archive · map to 2026-27 Select Class 12 and the subject. The official portal includes answer sections. Older exemplars require checking each question against the current syllabus.
KVS student support material · Class 12 · 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 12, subject and medium. This is a searchable portal, not a promise of a specific playable lesson.