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Class 10th notes
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Channel Class 10th notes (@class_10_notes) in the English language segment is an active participant. Currently, the community unites 23 897 subscribers, ranking 8 322 in the Education category and 18 188 in the India region.
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Thanks to the high frequency of updates (latest data received on 20 June, 2026), the channel maintains relevance and a high level of publication reach. Analytics show that the audience actively interacts with content, making it an important point of influence in the Education category.
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π§ Memory Tricks for Class 10 Science
π₯ Physical vs Chemical Changes
1. Burning β Chemical (new substance + energy released)
2. Melting/Ice β Physical (no new substance, just state change)
3. Boiling water β Physical
4. Rusting iron β Chemical (new brown flaky substance)
5. Cutting vegetables β Physical
6. Cooking vegetables β Chemical (new taste, smell, canβt reverse)
7. Dissolving salt in water β Physical (can get salt back)
8. Dissolving milk powder in water β Physical
9. Fermentation of sugar β Chemical (alcohol forms, irreversible)
10. Photosynthesis β Chemical (new glucose + Oβ formed)
π Shortcut: If new substance is formed β Chemical. If only appearance changes β Physical.
βοΈ Acids, Bases & Salts
1. Acid + Metal β Hβ gas (remember: βAcid attacks Metal β Hydrogen fliesβ)
Example: Zn + HβSOβ β ZnSOβ + Hββ
2. Acid + Base β Salt + Water (Neutralization reaction π)
Example: HCl + NaOH β NaCl + HβO
3. Carbonate + Acid β COβ gas (remember: βC-A β COββ)
Example: NaβCOβ + HCl β NaCl + COββ + HβO
4. Bases feel soapy, Acids taste sour (donβt taste in lab π just remember lemon = acid, soap = base).
5. Litmus Test:
Acid β Blue to Red
Base β Red to Blue
π Types of Chemical Reactions
1. Combination = Coming Together
A + B β AB
(Example: C + Oβ β COβ)
2. Decomposition = Breaking
AB β A + B
(Heat/Light/Electricity used to break down)
3. Displacement = Strong pushes Weak
A + BC β AC + B
(Example: Zn + CuSOβ β ZnSOβ + Cu)
4. Double Displacement = Exchange of Partners π
AB + CD β AD + CB
(Example: NaβSOβ + BaClβ β BaSOββ + NaCl)
5. Oxidation = Oxygen Gain / Hydrogen Loss
6. Reduction = Oxygen Loss / Hydrogen Gain
π Trick: OIL RIG β Oxidation Is Loss, Reduction Is Gain (of electrons).
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π Super Quick Exam Hacks
Burning, Cooking, Rusting, Photosynthesis, Digestion = Chemical
Cutting, Melting, Boiling, Dissolving (reversible) = Physical
Color change, gas formation, heat/light, precipitate = Always Chemical Reaction sign
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This question may look very easy, but Iβve seen many students making mistakes in it.
Always remember these two keywords:
π Burning = Chemical reaction π Melting = Physical reactionNow, in this question they are asking about burning, so the correct answer will be Chemical Reaction.
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Above are all the previous year questions of chapter 1 chemical reaction and questions π
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When dilute hydrochloric acid reacts with copper oxide powder, a blue-green solution forms. What is the new compound responsible for this color?
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Which of the following equations for the reaction of iron with steam is correctly balanced?
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What is the correct coefficient for FeSOβ when the equation is balanced: FeSOβ(s) β FeβOβ(s) + SOβ(g) + SOβ(g)?
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Which set of coefficients correctly balances the equation: Al(s) + CuClβ(aq) β AlClβ(aq) + Cu(s)?
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Identify the type of reaction: 2Hβ(g) + Oβ(g) β 2HβO(l)
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Identify the type of reaction: Fe(s) + CuSOβ(aq) β FeSOβ(aq) + Cu(s)
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Identify the type of reaction: NaβSOβ(aq) + BaClβ(aq) β BaSOβ(s) + 2NaCl(aq)
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Select the correctly balanced equation for the thermal decomposition of lead(II) nitrate.
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Complete and balance the following reaction: FeβOβ + Al β
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Which option shows the correctly balanced equation with physical states for the reaction between aqueous silver nitrate and aqueous sodium chloride?
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What happens when white silver chloride is exposed to sunlight, and what type of reaction is this?
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On what fundamental principle is the balancing of chemical equations based?
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Which of the following is a balanced equation for a double displacement reaction?
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How are oxidation and reduction defined in terms of oxygen or electrons?
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What happens chemically when quicklime (calcium oxide) is added to a bucket of water?
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What is the main difference between an endothermic and an exothermic reaction?
