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🇮🇳 ICSE Class 10 · flashcards
ICSE Class 10 Chemistry Flashcards
51 question-and-answer cards covering Chemistry as it is examined in ICSE Class 10. 24 of them are printed below, taken from across the deck — no signup, no paywall on the preview.
24 sample cards from the Chemistry deck
Sampled from the end of the deck, so these are different cards from the ones shown on the syllabus page.
Define an acid according to the modern (Arrhenius) concept.
An acid is a substance that produces hydrogen ions (H+) / hydronium ions (H3O+) as the only positive ions when dissolved in water.
Define a base and an alkali.
A base is a substance that reacts with an acid to form salt and water; an alkali is a water-soluble base that produces hydroxide ions (OH-) in water.
What is the difference between a strong acid and a weak acid?
A strong acid ionises almost completely in water (e.g. HCl, H2SO4, HNO3); a weak acid ionises only partially (e.g. acetic acid, carbonic acid).
What is the action of acids and bases on litmus?
Acids turn blue litmus red; bases (alkalis) turn red litmus blue.
State the colours of methyl orange in acidic and basic solutions.
Methyl orange is red/pink in acid and yellow in alkali.
State the colours of phenolphthalein in acidic and basic solutions.
Phenolphthalein is colourless in acid (and neutral) and pink in alkali.
What is the pH scale and what do its values indicate?
A scale from 0 to 14 measuring acidity/alkalinity: pH < 7 is acidic, pH = 7 is neutral, pH > 7 is alkaline (basic).
What is a neutralisation reaction? Give its general equation.
The reaction of an acid with a base to form salt and water. General: Acid + Base → Salt + Water (e.g. HCl + NaOH → NaCl + H2O).
Define a normal salt, an acid salt, and a basic salt.
Normal salt: formed by complete replacement of acid's H with metal (NaCl). Acid salt: has replaceable H remaining (NaHSO4). Basic salt: contains OH or O along with the metal ion (Pb(OH)Cl).
What is an efflorescent substance? Give an example.
A substance that loses its water of crystallisation on exposure to air, e.g. washing soda (Na2CO3·10H2O).
What is a deliquescent substance? Give an example.
A substance that absorbs moisture from the air and dissolves in it, e.g. caustic soda (NaOH) or anhydrous CaCl2.
What is a hygroscopic substance? Give an example.
A substance that absorbs moisture from air without dissolving (no change of state), e.g. conc. sulphuric acid or quicklime (CaO).
What is water of crystallisation? Give an example with formula.
The fixed number of water molecules chemically combined in one formula unit of a crystalline salt, e.g. blue vitriol CuSO4·5H2O (5 molecules).
What colour precipitates do solutions of Cu2+, Fe2+, and Fe3+ give with sodium hydroxide?
Cu2+ gives a pale blue ppt; Fe2+ gives a dirty green ppt; Fe3+ gives a reddish-brown ppt.
What is observed when NH4OH (ammonium hydroxide) is added to a solution containing Cu2+ ions?
A pale blue precipitate forms first, which dissolves in excess to give a deep/inky blue solution (due to a complex).
What precipitate does a lead salt (Pb2+) form with sodium hydroxide, and what happens in excess?
A white precipitate of Pb(OH)2 forms, which dissolves in excess NaOH (being amphoteric).
How is the gas ammonia (NH3) identified in the lab?
It has a pungent smell, turns moist red litmus blue, and gives dense white fumes with a glass rod dipped in conc. HCl.
How is hydrogen chloride gas (HCl) identified?
It is pungent, turns moist blue litmus red, and gives dense white fumes with ammonia (a glass rod dipped in NH4OH).
State Avogadro's law.
Equal volumes of all gases, under the same conditions of temperature and pressure, contain an equal number of molecules.
What is the value of Avogadro's number?
6.022 × 10^23 (the number of particles in one mole).
What is molar volume (gram molecular volume) of a gas at STP?
22.4 litres (22,400 cm³) per mole at standard temperature and pressure.
Define relative molecular mass.
The number of times one molecule of a substance is heavier than 1/12th the mass of an atom of carbon-12 (numerically the sum of the atomic masses of all atoms in the molecule).
What is the relationship between number of moles, mass, and molar mass?
Number of moles = given mass / molar mass.
State Gay-Lussac's law of combining volumes.
When gases react, they do so in volumes which bear a simple whole-number ratio to one another and to the volumes of gaseous products, measured at the same temperature and pressure.
What this deck covers
The Chemistry deck follows the ICSE Class 10 Chemistry syllabus — 1 chapters and 5 topics — so questions land on material that is genuinely examinable rather than trivia around it. That works out to roughly 51.0 cards per chapter.
Answers are written to be recallable, not just readable — averaging about 112 characters, which is long enough to carry the reasoning and short enough to say out loud.
A deck like this earns its keep on the second and third pass. Read the syllabus first so you know the shape of the subject, then use the cards to find the specific facts that have not stuck.
Chemistry flashcards FAQ
How many Chemistry flashcards are in this ICSE Class 10 deck?
51 cards. This page previews 24 of them, sampled evenly across the deck so you can judge the difficulty before installing anything.
Are these ICSE Class 10 flashcards free?
Yes. The preview here is free to read with no signup, and the full 51-card deck is free inside the Examius app.
What do the Chemistry cards cover?
They follow the ICSE Class 10 Chemistry syllabus — 1 chapters and 5 topics — so the questions track what is actually examinable.
How should I use these flashcards?
Read the syllabus first so you know the shape of the subject, then drill the deck. Examius schedules each card with spaced repetition, so cards you keep missing come back sooner and ones you know drift further apart.