ICSE Class 10 Chemistry Important Topics 2027
Last updated:
Every topic ranked by how often and how recently it was asked in 4 board + 5 official sample papers (2023–2027). Teal tags = board papers, orange tags = official sample papers.
Top 10 most important topics
| # | Topic | Chapter | Asked in | Importance |
|---|---|---|---|---|
| 1 | distinguishing metals / salts by chemical tests | Analytical Chemistry | Sample 2024Sample 2025Sample 2026Sample 2027 | ★★★★★ |
| 2 | structural formula and IUPAC naming | Organic Chemistry | Board 2023Board 2025Sample 2023Sample 2024Sample 2025 | ★★★★☆ |
| 3 | composition of alloys | Metallurgy | Board 2023Board 2024Sample 2023Sample 2024Sample 2025 | ★★★★☆ |
| 4 | pH scale and acid / base behaviour | Study of Acids, Bases and Salts | Sample 2025Sample 2026Sample 2027 | ★★★★☆ |
| 5 | mole-mass-volume stoichiometry | Mole Concept and Stoichiometry | Board 2026Sample 2026Sample 2027 | ★★★★☆ |
| 6 | molar volume at STP | Mole Concept and Stoichiometry | Board 2024Sample 2026Sample 2027 | ★★★★☆ |
| 7 | IUPAC naming and structural formula | Organic Chemistry | Board 2024Sample 2026Sample 2027 | ★★★★☆ |
| 8 | reducing action of ammonia on copper oxide | Study of Compounds - Ammonia | Board 2024Board 2025Sample 2024Sample 2025 | ★★★☆☆ |
| 9 | action of sodium hydroxide on ammonium salts | Analytical Chemistry | Sample 2024Sample 2025Sample 2026 | ★★★☆☆ |
| 10 | processes, ores and bonding (mixed) | Metallurgy | Sample 2024Sample 2025Sample 2026 | ★★★☆☆ |
Chapter-wise important topics
Periodic Properties and Variations of Properties · Periodic Table and Chemical Bonding
| electron affinity, electronegativity and periodic position asked 3× | Sample 2024Sample 2025Sample 2026 | ★★★☆☆ |
| mixed fill-in-the-blanks across chapters asked 2× | Sample 2024Sample 2025 | ★★☆☆☆ |
| metallic character and reducing agents from configuration asked 2× | Sample 2024Sample 2025 | ★★☆☆☆ |
| reactivity trend of halogens asked 1× | Sample 2027 | ★★☆☆☆ |
| reactivity and electron affinity of halogens asked 1× | Sample 2027 | ★★☆☆☆ |
| position and atomic radius from electronic configuration asked 1× | Sample 2027 | ★★☆☆☆ |
| valency, group and hydroxide formula from oxide asked 1× | Sample 2027 | ★★☆☆☆ |
| electron affinity trend asked 2× | Board 2024Sample 2023 | ★☆☆☆☆ |
| atomic radius trend across a period asked 1× | Sample 2026 | ★☆☆☆☆ |
| properties from atomic number (electron affinity, bonding) asked 1× | Sample 2026 | ★☆☆☆☆ |
| isotopes and periodic classification by atomic number asked 1× | Sample 2025 | ★☆☆☆☆ |
| electropositive / metallic character trend asked 1× | Sample 2025 | ★☆☆☆☆ |
| ion formation by alkali metals asked 1× | Sample 2025 | ★☆☆☆☆ |
| valency / group from oxide formula asked 1× | Sample 2025 | ★☆☆☆☆ |
| non-metals form acidic oxides asked 1× | Sample 2024 | ★☆☆☆☆ |
| valence electrons from group number asked 1× | Sample 2024 | ★☆☆☆☆ |
| periodic trends across a period asked 1× | Board 2026 | ★☆☆☆☆ |
| electronegativity and atomic size trends asked 1× | Board 2026 | ★☆☆☆☆ |
| atomic radius, valence electrons, electropositivity asked 1× | Board 2026 | ★☆☆☆☆ |
| position of element in periodic table asked 1× | Sample 2023 | ★☆☆☆☆ |
| ordering by electronegativity / metallic character / atomic size asked 1× | Sample 2023 | ★☆☆☆☆ |
| period, group, metallic character and compound formula asked 1× | Sample 2023 | ★☆☆☆☆ |
| metallic character / reactivity down a group asked 1× | Board 2025 | ★☆☆☆☆ |
| metallic / reducing character down a group asked 1× | Board 2025 | ★☆☆☆☆ |
| period from atomic number; compound formula asked 1× | Board 2025 | ★☆☆☆☆ |
| valency, catenation and compound formula from periodic position asked 1× | Board 2025 | ★☆☆☆☆ |
| ionisation potential trend asked 1× | Board 2025 | ★☆☆☆☆ |
| ionisation potential of noble gas asked 1× | Board 2024 | ★☆☆☆☆ |
| ordering by atomic size / basicity / ionisation potential asked 1× | Board 2024 | ★☆☆☆☆ |
| identify element from periodic position / configuration asked 1× | Board 2024 | ★☆☆☆☆ |
| electron affinity of noble gas asked 1× | Board 2023 | ★☆☆☆☆ |
| atomic radius trend asked 1× | Board 2023 | ★☆☆☆☆ |
| state the term / process (mixed) asked 1× | Board 2023 | ★☆☆☆☆ |
| order of reactivity / non-metallic character / valence electrons asked 1× | Board 2023 | ★☆☆☆☆ |
| define term / law (mixed) asked 1× | Board 2023 | ★☆☆☆☆ |
| reasoning on ionisation potential and ionic conduction asked 1× | Board 2023 | ★☆☆☆☆ |
Chemical Bonding · Periodic Table and Chemical Bonding
| identify the term (mixed) asked 3× | Sample 2024Sample 2025Sample 2026 | ★★★☆☆ |
| lone pairs in ions asked 2× | Sample 2026Sample 2027 | ★★★☆☆ |
| coordinate bond in ammonium ion asked 2× | Sample 2025Sample 2026 | ★★☆☆☆ |
| high melting point of ionic compounds asked 2× | Board 2026Sample 2027 | ★★☆☆☆ |
| covalent bonding and electron dot structure asked 1× | Sample 2027 | ★★☆☆☆ |
| ionic compound formation and molar mass asked 1× | Sample 2027 | ★★☆☆☆ |
| electron dot structures; coordinate bond asked 1× | Sample 2027 | ★★☆☆☆ |
| valency and formula of chloride asked 1× | Sample 2025 | ★☆☆☆☆ |
| valence electrons and ion formation asked 1× | Sample 2024 | ★☆☆☆☆ |
| electrovalent bonding; mole calculation asked 1× | Sample 2024 | ★☆☆☆☆ |
| coordinate bond in hydronium ion asked 1× | Sample 2024 | ★☆☆☆☆ |
| formation of ionic bond from group positions asked 1× | Board 2026 | ★☆☆☆☆ |
| ion formation and electronic configuration asked 1× | Board 2026 | ★☆☆☆☆ |
| compound formula and electron dot structure asked 1× | Board 2026 | ★☆☆☆☆ |
| polar covalent molecules asked 1× | Sample 2023 | ★☆☆☆☆ |
| covalent bonding, lone pairs, ionic conduction asked 1× | Sample 2023 | ★☆☆☆☆ |
| electron dot structures; coordinate bond in hydronium ion asked 1× | Sample 2023 | ★☆☆☆☆ |
| electronic configuration in covalent bonding asked 1× | Board 2025 | ★☆☆☆☆ |
| isoelectronic ions asked 1× | Board 2025 | ★☆☆☆☆ |
| electron dot / coordinate bonding structures asked 1× | Board 2025 | ★☆☆☆☆ |
| electron pairs in water molecule asked 1× | Board 2024 | ★☆☆☆☆ |
| classify substances (bonding / periodic / acids) asked 1× | Board 2024 | ★☆☆☆☆ |
| electron dot structures asked 1× | Board 2024 | ★☆☆☆☆ |
| reasoning on inert gases and covalent properties asked 1× | Board 2024 | ★☆☆☆☆ |
| polar/non-polar molecules; electrolysis of water asked 1× | Board 2024 | ★☆☆☆☆ |
| formula from electronic configuration; catenation asked 1× | Board 2024 | ★☆☆☆☆ |
| properties of ionic and covalent compounds asked 1× | Board 2023 | ★☆☆☆☆ |
| electron dot structures; coordinate bond in ammonium ion asked 1× | Board 2023 | ★☆☆☆☆ |
| classify compounds (thermal dissociation / amphoteric / non-electrolyte) asked 1× | Board 2023 | ★☆☆☆☆ |
Study of Acids, Bases and Salts · Acids, Bases, Salts and Analytical Chemistry
| pH scale and acid / base behaviour asked 3× | Sample 2025Sample 2026Sample 2027 | ★★★★☆ |
| methods of preparation of salts with equations asked 3× | Board 2026Sample 2025Sample 2026 | ★★★☆☆ |
| reactions producing water asked 2× | Sample 2026Sample 2027 | ★★★☆☆ |
| reactions of zinc; preparation of zinc salts asked 2× | Sample 2026Sample 2027 | ★★★☆☆ |
| basicity of acids asked 2× | Sample 2023Sample 2024 | ★★☆☆☆ |
| hydracids from non-metals and hydrogen asked 1× | Sample 2027 | ★★☆☆☆ |
| pH scale and neutrality asked 1× | Sample 2027 | ★★☆☆☆ |
| basic oxides, alkalis and salt formation asked 1× | Sample 2027 | ★★☆☆☆ |
| methods of preparation of salts asked 2× | Board 2024Board 2025 | ★☆☆☆☆ |
| indicators in alkaline solution asked 2× | Board 2023Sample 2023 | ★☆☆☆☆ |
| ionisation of salts vs acids / bases asked 1× | Sample 2026 | ★☆☆☆☆ |
| pH scale and acidity asked 1× | Sample 2026 | ★☆☆☆☆ |
| classification and nature of oxides asked 1× | Sample 2025 | ★☆☆☆☆ |
| pH scale; group from atomic number asked 1× | Sample 2024 | ★☆☆☆☆ |
| acidity of a base / hydroxyl ions asked 1× | Board 2026 | ★☆☆☆☆ |
| methods of preparation of salts; copper unreactive with dilute acid asked 1× | Board 2026 | ★☆☆☆☆ |
| basicity of acids; conduction mechanism asked 1× | Board 2026 | ★☆☆☆☆ |
| basicity / acid salts; periodic trend asked 1× | Board 2026 | ★☆☆☆☆ |
| classification of oxides and alkalis asked 1× | Sample 2023 | ★☆☆☆☆ |
| preparation of insoluble salt by precipitation asked 1× | Board 2025 | ★☆☆☆☆ |
| pH scale and acid / alkali behaviour asked 1× | Board 2024 | ★☆☆☆☆ |
| acid salts and basicity of acids asked 1× | Board 2023 | ★☆☆☆☆ |
Analytical Chemistry · Acids, Bases, Salts and Analytical Chemistry
| distinguishing metals / salts by chemical tests asked 4× | Sample 2024Sample 2025Sample 2026Sample 2027 | ★★★★★ |
| action of sodium hydroxide on ammonium salts asked 3× | Sample 2024Sample 2025Sample 2026 | ★★★☆☆ |
| identify salt from thermal decomposition and precipitate asked 2× | Sample 2025Sample 2026 | ★★☆☆☆ |
| precipitate reactions; special action of ammonium hydroxide on copper asked 2× | Sample 2025Sample 2026 | ★★☆☆☆ |
| state observation of the given reaction asked 2× | Board 2025Board 2026 | ★★☆☆☆ |
| distinguishing salts by chemical tests asked 2× | Board 2025Sample 2023 | ★★☆☆☆ |
| identification of hydrogen sulphide (sulphide) asked 1× | Sample 2027 | ★★☆☆☆ |
| identify salt and precipitate from reaction with sodium hydroxide asked 1× | Sample 2027 | ★★☆☆☆ |
| identify cation and anion from precipitate observations asked 2× | Board 2024Board 2026 | ★★☆☆☆ |
| identification of sulphur dioxide (sulphite) asked 1× | Sample 2026 | ★☆☆☆☆ |
| amphoteric oxide asked 1× | Sample 2026 | ★☆☆☆☆ |
| action of ammonium hydroxide on salt solutions asked 1× | Sample 2025 | ★☆☆☆☆ |
| distinguishing lead and zinc salts asked 1× | Sample 2025 | ★☆☆☆☆ |
| identification of copper sulphate salt and its reactions asked 1× | Sample 2024 | ★☆☆☆☆ |
| precipitate observations asked 1× | Sample 2024 | ★☆☆☆☆ |
| identify gas / anion / particles asked 1× | Sample 2024 | ★☆☆☆☆ |
| amphoteric hydroxide soluble in excess NaOH asked 1× | Sample 2023 | ★☆☆☆☆ |
| properties of salts / oxides / hydroxides (mixed) asked 1× | Sample 2023 | ★☆☆☆☆ |
| identify anion from observations (sulphate / carbonate) asked 1× | Sample 2023 | ★☆☆☆☆ |
| identify cation from precipitate / colour asked 1× | Sample 2023 | ★☆☆☆☆ |
| observations of precipitate / electrolysis reactions asked 1× | Sample 2023 | ★☆☆☆☆ |
| identify gas produced in reactions asked 1× | Board 2025 | ★☆☆☆☆ |
| distinguishing silver chloride and lead chloride asked 1× | Board 2025 | ★☆☆☆☆ |
| classification of oxides (basic / acidic / amphoteric) asked 1× | Board 2025 | ★☆☆☆☆ |
| identify compound from description asked 1× | Board 2025 | ★☆☆☆☆ |
| amphoteric hydroxide asked 1× | Board 2024 | ★☆☆☆☆ |
| identification of gas by smell (sulphide) asked 1× | Board 2024 | ★☆☆☆☆ |
| identify anion from observations (carbonate / nitrate) asked 1× | Board 2024 | ★☆☆☆☆ |
| identify gas evolved from reactions asked 1× | Board 2024 | ★☆☆☆☆ |
| special action of ammonium hydroxide on copper salts asked 1× | Board 2023 | ★☆☆☆☆ |
| mixed fill-in-the-blanks across chapters asked 1× | Board 2023 | ★☆☆☆☆ |
| identify cation from hydroxide precipitate behaviour asked 1× | Board 2023 | ★☆☆☆☆ |
| identify anion from observations asked 1× | Board 2023 | ★☆☆☆☆ |
| identify substance from reactions / precipitate colour asked 1× | Board 2023 | ★☆☆☆☆ |
Mole Concept and Stoichiometry · Mole Concept and Stoichiometry
| mole-mass-volume stoichiometry asked 3× | Board 2026Sample 2026Sample 2027 | ★★★★☆ |
| molar volume at STP asked 3× | Board 2024Sample 2026Sample 2027 | ★★★★☆ |
| mole ratio and volume ratio of gases asked 2× | Sample 2025Sample 2026 | ★★☆☆☆ |
| gaseous volume stoichiometry asked 3× | Board 2024Board 2026Sample 2023 | ★★☆☆☆ |
| molecular formula from vapour density asked 2× | Board 2025Sample 2027 | ★★☆☆☆ |
| mass-volume and mass-mass stoichiometry asked 2× | Sample 2024Sample 2025 | ★★☆☆☆ |
| empirical and molecular formula from percentage composition asked 2× | Board 2025Sample 2023 | ★★☆☆☆ |
| relation between mass, molar mass and moles asked 1× | Sample 2027 | ★★☆☆☆ |
| combustion of methane and volume ratio asked 1× | Sample 2027 | ★★☆☆☆ |
| vapour density = molecular mass / 2 asked 2× | Board 2023Sample 2023 | ★☆☆☆☆ |
| mole and number of molecules asked 1× | Sample 2026 | ★☆☆☆☆ |
| mole, mass and Avogadro's number asked 1× | Sample 2025 | ★☆☆☆☆ |
| empirical formula from combining masses asked 1× | Sample 2025 | ★☆☆☆☆ |
| gaseous volume stoichiometry of a mixture asked 1× | Sample 2025 | ★☆☆☆☆ |
| mole and number of atoms asked 1× | Sample 2024 | ★☆☆☆☆ |
| relative molecular mass from equal volumes asked 1× | Sample 2024 | ★☆☆☆☆ |
| molecular formula and mass of an element in a mole asked 1× | Sample 2024 | ★☆☆☆☆ |
| Avogadro's law; number of molecules asked 1× | Board 2026 | ★☆☆☆☆ |
| molecular weight and vapour density from molar volume asked 1× | Board 2026 | ★☆☆☆☆ |
| vapour density from equal volumes; empirical formula asked 1× | Sample 2023 | ★☆☆☆☆ |
| define law / term asked 1× | Sample 2023 | ★☆☆☆☆ |
| gaseous volume stoichiometry with limiting reactant asked 1× | Board 2025 | ★☆☆☆☆ |
| mass-mass and mass-volume stoichiometry asked 1× | Board 2025 | ★☆☆☆☆ |
| vapour density and molecular weight from equal volumes asked 1× | Board 2025 | ★☆☆☆☆ |
| state law / define term (mixed) asked 1× | Board 2025 | ★☆☆☆☆ |
| define term (mixed: molar volume / normal salt) asked 1× | Board 2024 | ★☆☆☆☆ |
| mass-mole-volume calculations from equation asked 1× | Board 2024 | ★☆☆☆☆ |
| gaseous volume stoichiometry (Gay Lussac) asked 1× | Board 2023 | ★☆☆☆☆ |
| molecular formula from empirical formula and molecular mass asked 1× | Board 2023 | ★☆☆☆☆ |
| percentage composition; empirical formula asked 1× | Board 2023 | ★☆☆☆☆ |
Electrolysis · Electrolysis and Metallurgy
| conduction by ions in electrolytes asked 2× | Sample 2025Sample 2026 | ★★☆☆☆ |
| electroplating with copper / nickel / silver asked 2× | Sample 2025Sample 2026 | ★★☆☆☆ |
| oxidation, reduction, ionization, dissociation asked 2× | Board 2026Sample 2027 | ★★☆☆☆ |
| electrolysis of acidified water asked 2× | Board 2025Sample 2027 | ★★☆☆☆ |
| electrolysis of copper sulphate with inert / active electrodes asked 2× | Sample 2024Sample 2025 | ★★☆☆☆ |
| oxidation at anode in electrolysis of copper sulphate asked 2× | Sample 2024Sample 2025 | ★★☆☆☆ |
| electro-refining of copper asked 2× | Board 2023Sample 2026 | ★★☆☆☆ |
| electrolysis of copper sulphate with copper electrodes asked 2× | Board 2025Board 2026 | ★★☆☆☆ |
| mixed fill-in-the-blanks across chapters asked 2× | Board 2025Board 2026 | ★★☆☆☆ |
| conduction by ions vs electrons asked 1× | Sample 2027 | ★★☆☆☆ |
| conduction by free ions asked 1× | Sample 2026 | ★☆☆☆☆ |
| electroplating setup with silver asked 1× | Sample 2024 | ★☆☆☆☆ |
| electrolysis as a redox process asked 1× | Sample 2024 | ★☆☆☆☆ |
| strong / weak electrolytes and mobile ions asked 1× | Board 2026 | ★☆☆☆☆ |
| electrolysis of acidified water - gas ratio asked 1× | Board 2026 | ★☆☆☆☆ |
| cathode reaction in extraction of aluminium asked 1× | Board 2026 | ★☆☆☆☆ |
| electroplating with silver asked 1× | Board 2026 | ★☆☆☆☆ |
| electrolytes: ions vs molecules; acidity asked 1× | Board 2026 | ★☆☆☆☆ |
| weak electrolytes asked 1× | Sample 2023 | ★☆☆☆☆ |
| cathode product in electroplating asked 1× | Sample 2023 | ★☆☆☆☆ |
| electrolysis of copper sulphate with inert electrodes asked 1× | Sample 2023 | ★☆☆☆☆ |
| particles in electrolytes and non-electrolytes asked 1× | Sample 2023 | ★☆☆☆☆ |
| oxidation at anode; inert electrodes asked 1× | Board 2025 | ★☆☆☆☆ |
| electroplating with nickel asked 1× | Board 2024 | ★☆☆☆☆ |
| ionization vs electrolytic dissociation asked 1× | Board 2024 | ★☆☆☆☆ |
| electrode reaction in electroplating asked 1× | Board 2023 | ★☆☆☆☆ |
| selective discharge of ions asked 1× | Board 2023 | ★☆☆☆☆ |
Metallurgy · Electrolysis and Metallurgy
| composition of alloys asked 5× | Board 2023Board 2024Sample 2023Sample 2024Sample 2025 | ★★★★☆ |
| processes, ores and bonding (mixed) asked 3× | Sample 2024Sample 2025Sample 2026 | ★★★☆☆ |
| electrolytic extraction of aluminium asked 3× | Sample 2024Sample 2025Sample 2026 | ★★★☆☆ |
| mixed fill-in-the-blanks across chapters asked 2× | Board 2024Sample 2026 | ★★☆☆☆ |
| main metal in alloys asked 2× | Board 2024Sample 2026 | ★★☆☆☆ |
| reducing action of hydrogen on metal oxide asked 1× | Sample 2027 | ★★☆☆☆ |
| electrode material, alloy, calcination asked 1× | Sample 2027 | ★★☆☆☆ |
| reduction of oxide; roasting; precipitation asked 1× | Sample 2026 | ★☆☆☆☆ |
| displacement and reactivity series asked 1× | Sample 2025 | ★☆☆☆☆ |
| Hall-Heroult electrolytic reduction of alumina asked 1× | Sample 2025 | ★☆☆☆☆ |
| displacement reaction and reactivity series asked 1× | Sample 2024 | ★☆☆☆☆ |
| ores of zinc and aluminium asked 1× | Sample 2024 | ★☆☆☆☆ |
| reactivity series - action of dilute acid on metals asked 1× | Board 2026 | ★☆☆☆☆ |
| Bayer's process for purification of bauxite asked 1× | Board 2026 | ★☆☆☆☆ |
| roles of substances in extraction of aluminium asked 1× | Sample 2023 | ★☆☆☆☆ |
| reduction of metallic oxides and reactivity series asked 1× | Board 2025 | ★☆☆☆☆ |
| concentration of ore by magnetic separation asked 1× | Board 2025 | ★☆☆☆☆ |
| Baeyer's process; purification of bauxite asked 1× | Board 2025 | ★☆☆☆☆ |
| electrolyte mixture in Hall-Heroult process asked 1× | Board 2024 | ★☆☆☆☆ |
| definition of ore asked 1× | Board 2024 | ★☆☆☆☆ |
| ores / empirical formula asked 1× | Board 2024 | ★☆☆☆☆ |
| ores of aluminium asked 1× | Board 2023 | ★☆☆☆☆ |
| Hall-Heroult electrolytic extraction of aluminium asked 1× | Board 2023 | ★☆☆☆☆ |
| uses of alloys asked 1× | Board 2023 | ★☆☆☆☆ |
Study of Compounds - Hydrogen Chloride · Study of Compounds
| laboratory preparation of HCl gas asked 2× | Board 2024Sample 2023 | ★☆☆☆☆ |
| drying agent for HCl gas asked 2× | Board 2023Sample 2023 | ★☆☆☆☆ |
| preparation of HCl; addition reaction of ethene asked 1× | Sample 2026 | ★☆☆☆☆ |
| collection of hydrogen chloride gas asked 1× | Sample 2025 | ★☆☆☆☆ |
| fountain experiment; solubility of HCl and ammonia asked 1× | Sample 2024 | ★☆☆☆☆ |
| reasoning on gas preparation / properties asked 1× | Board 2023 | ★☆☆☆☆ |
Study of Compounds - Ammonia · Study of Compounds
| reducing action of ammonia on copper oxide asked 4× | Board 2024Board 2025Sample 2024Sample 2025 | ★★★☆☆ |
| reaction of ammonia with excess chlorine; thermal decomposition of nitrate asked 2× | Sample 2026Sample 2027 | ★★★☆☆ |
| reducing / oxidising reactions of ammonia; roasting asked 1× | Sample 2027 | ★★☆☆☆ |
| action of alkali on ammonium salts; burning of ammonia asked 1× | Sample 2027 | ★★☆☆☆ |
| reducing action of ammonia; drying of HCl gas asked 1× | Sample 2026 | ★☆☆☆☆ |
| balanced equations (mixed) asked 1× | Sample 2026 | ★☆☆☆☆ |
| alkaline nature of ammonia (litmus test) asked 1× | Sample 2024 | ★☆☆☆☆ |
| Haber's process conditions asked 1× | Sample 2024 | ★☆☆☆☆ |
| Haber process; fountain experiment asked 1× | Board 2026 | ★☆☆☆☆ |
| catalyst in Haber's process asked 1× | Sample 2023 | ★☆☆☆☆ |
| laboratory preparation of ammonia asked 1× | Sample 2023 | ★☆☆☆☆ |
| solubility of ammonia; ionic equation asked 1× | Sample 2023 | ★☆☆☆☆ |
| preparation of ammonia from aluminium nitride asked 1× | Board 2025 | ★☆☆☆☆ |
| match reaction with catalyst / reagent (industrial processes) asked 1× | Board 2025 | ★☆☆☆☆ |
| collection of ammonia gas asked 1× | Board 2024 | ★☆☆☆☆ |
| complete and balance equations (mixed) asked 1× | Board 2023 | ★☆☆☆☆ |
| ammonia from nitrides; test for ammonia asked 1× | Board 2023 | ★☆☆☆☆ |
| state observations (mixed analytical / ammonia) asked 1× | Board 2023 | ★☆☆☆☆ |
| balanced equations for conversions (mixed) asked 1× | Board 2023 | ★☆☆☆☆ |
Study of Compounds - Nitric Acid · Study of Compounds
| action of nitric acid on carbonate asked 3× | Sample 2024Sample 2025Sample 2026 | ★★★☆☆ |
| balanced equations (mixed) asked 3× | Sample 2024Sample 2025Sample 2026 | ★★★☆☆ |
| oxidising nature of nitric acid; electroplating asked 1× | Sample 2026 | ★☆☆☆☆ |
| Ostwald's process for nitric acid asked 1× | Sample 2025 | ★☆☆☆☆ |
| properties of nitric acid asked 1× | Sample 2024 | ★☆☆☆☆ |
| catalyst in Ostwald's process asked 1× | Sample 2024 | ★☆☆☆☆ |
| laboratory preparation of nitric acid asked 1× | Board 2026 | ★☆☆☆☆ |
| decomposition and storage of nitric acid asked 1× | Board 2026 | ★☆☆☆☆ |
| oxidising action of concentrated nitric acid on carbon asked 1× | Board 2026 | ★☆☆☆☆ |
| oxidation by nitric acid; action of acid on sulphide asked 1× | Sample 2023 | ★☆☆☆☆ |
| decomposition of nitric acid; back suction; corrosive acid asked 1× | Sample 2023 | ★☆☆☆☆ |
| balanced equations (mixed acids) asked 1× | Board 2025 | ★☆☆☆☆ |
| oxidising action of concentrated nitric acid on copper asked 1× | Board 2025 | ★☆☆☆☆ |
| balanced equations (nitric acid oxidation; ammonia from nitride) asked 1× | Board 2024 | ★☆☆☆☆ |
| thermal decomposition of nitrates asked 1× | Board 2023 | ★☆☆☆☆ |
| displacement of nitric acid by non-volatile sulphuric acid asked 1× | Board 2023 | ★☆☆☆☆ |
Study of Compounds - Sulphuric Acid · Study of Compounds
| oxidising action of concentrated sulphuric acid asked 3× | Board 2024Board 2025Sample 2023 | ★★☆☆☆ |
| non-volatile and oxidising properties of sulphuric acid asked 2× | Sample 2024Sample 2025 | ★★☆☆☆ |
| Contact process - absorption of SO3 asked 2× | Board 2025Board 2026 | ★★☆☆☆ |
| absorption of SO3 in Contact process asked 1× | Sample 2027 | ★★☆☆☆ |
| acidic nature of sulphuric acid asked 1× | Sample 2027 | ★★☆☆☆ |
| dehydrating action of concentrated sulphuric acid on hydrated salt asked 1× | Sample 2027 | ★★☆☆☆ |
| oxidising, dilute-acid and dehydrating properties of sulphuric acid asked 1× | Sample 2026 | ★☆☆☆☆ |
| dehydrating action of concentrated sulphuric acid asked 1× | Sample 2024 | ★☆☆☆☆ |
| oxidising action of concentrated sulphuric acid on carbon asked 1× | Board 2026 | ★☆☆☆☆ |
| conditions for Contact / Ostwald / Haber processes asked 1× | Sample 2023 | ★☆☆☆☆ |
| properties of concentrated sulphuric acid asked 1× | Sample 2023 | ★☆☆☆☆ |
| reducing property of sulphur dioxide asked 1× | Board 2025 | ★☆☆☆☆ |
| correcting statements on acid / ammonia properties asked 1× | Board 2024 | ★☆☆☆☆ |
| Contact process for sulphuric acid asked 1× | Board 2024 | ★☆☆☆☆ |
| distinguishing tests / bonding asked 1× | Board 2024 | ★☆☆☆☆ |
| non-volatile nature of sulphuric acid asked 1× | Board 2023 | ★☆☆☆☆ |
| dehydrating action; basicity / salts asked 1× | Board 2023 | ★☆☆☆☆ |
Organic Chemistry · Organic Chemistry
| structural formula and IUPAC naming asked 5× | Board 2023Board 2025Sample 2023Sample 2024Sample 2025 | ★★★★☆ |
| IUPAC naming and structural formula asked 3× | Board 2024Sample 2026Sample 2027 | ★★★★☆ |
| organic preparations; laboratory preparation of nitric acid asked 3× | Sample 2024Sample 2025Sample 2026 | ★★★☆☆ |
| esterification reaction asked 2× | Sample 2026Sample 2027 | ★★★☆☆ |
| isomerism of butene asked 2× | Sample 2025Sample 2026 | ★★☆☆☆ |
| mixed fill-in-the-blanks across chapters asked 2× | Sample 2023Sample 2027 | ★★☆☆☆ |
| molecular formula and functional groups asked 1× | Sample 2027 | ★★☆☆☆ |
| balanced equations (mixed) asked 1× | Sample 2027 | ★★☆☆☆ |
| organic preparations and reactions (mixed) asked 1× | Sample 2027 | ★★☆☆☆ |
| functional groups, isomerism, homologous series asked 1× | Sample 2027 | ★★☆☆☆ |
| complete and balance equations (mixed) asked 2× | Board 2024Board 2026 | ★★☆☆☆ |
| dehydration of ethanol asked 2× | Board 2024Sample 2023 | ★☆☆☆☆ |
| state the term (mixed) asked 2× | Board 2024Board 2025 | ★☆☆☆☆ |
| homologous series characteristics asked 1× | Sample 2026 | ★☆☆☆☆ |
| homologous series, isomerism, dehydration of alcohol asked 1× | Sample 2025 | ★☆☆☆☆ |
| functional group of alcohols asked 1× | Sample 2024 | ★☆☆☆☆ |
| reasoning on unsaturation, fuels, gas collection asked 1× | Sample 2024 | ★☆☆☆☆ |
| substitution (chlorination) of alkanes asked 1× | Board 2026 | ★☆☆☆☆ |
| saturated vs unsaturated hydrocarbons (cracking) asked 1× | Board 2026 | ★☆☆☆☆ |
| identifying alkene from molecular formula asked 1× | Board 2026 | ★☆☆☆☆ |
| identify term / compound (mixed) asked 1× | Board 2026 | ★☆☆☆☆ |
| IUPAC naming and structural formula, isomerism asked 1× | Board 2026 | ★☆☆☆☆ |
| addition (hydrogenation) of alkyne asked 1× | Board 2026 | ★☆☆☆☆ |
| isomerism; definition of salt asked 1× | Board 2026 | ★☆☆☆☆ |
| reactions of ethanol (dehydration, esterification, combustion) asked 1× | Board 2026 | ★☆☆☆☆ |
| IUPAC nomenclature asked 1× | Sample 2023 | ★☆☆☆☆ |
| identify the term (mixed) asked 1× | Sample 2023 | ★☆☆☆☆ |
| organic preparation and addition reactions asked 1× | Sample 2023 | ★☆☆☆☆ |
| functional groups (aldehyde / carboxylic acid) asked 1× | Sample 2023 | ★☆☆☆☆ |
| general formula of saturated hydrocarbons asked 1× | Board 2025 | ★☆☆☆☆ |
| homologous series asked 1× | Board 2025 | ★☆☆☆☆ |
| decarboxylation; acid-metal reaction asked 1× | Board 2025 | ★☆☆☆☆ |
| functional groups, isomerism, esterification asked 1× | Board 2025 | ★☆☆☆☆ |
| reactions of unsaturated hydrocarbons asked 1× | Board 2024 | ★☆☆☆☆ |
| esterification asked 1× | Board 2024 | ★☆☆☆☆ |
| identify organic compound from description asked 1× | Board 2024 | ★☆☆☆☆ |
| cyclic hydrocarbons asked 1× | Board 2023 | ★☆☆☆☆ |
| decarboxylation of sodium salt of carboxylic acid asked 1× | Board 2023 | ★☆☆☆☆ |
| general formula of alkanes asked 1× | Board 2023 | ★☆☆☆☆ |
| organic preparation reactions with conditions asked 1× | Board 2023 | ★☆☆☆☆ |
| isomerism and homologous series asked 1× | Board 2023 | ★☆☆☆☆ |
| ordering by molecular weight / preferential discharge asked 1× | Board 2023 | ★☆☆☆☆ |
Importance = how often a topic was asked × how recent, with extra weight for the latest official sample paper.