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SEBA Class 10 Science MCQ Chapter 1 - Chemical Reaction and Equations for HSLC 2026

Get 200+ MCQs of Chapter 1 - Chemical Reaction and Equations of Science class 10 SEBA Question Answer Solutions for HSLC 2026 exam with important multiple choice questions. Class 10 HSLC Science Chapter 1 - MCQs, Assertion and Reason, Statement based Questions, True False. Class 10 Science Multiple Choice Questions Answer solutions (English Medium). Get all chapter science MCQs of class 10 HSLC (SEBA) that cover all the topics. All MCQ (Multiple choice questions) solutions are prepared by experts and easy-to-understand.

📘 Science MCQs

Chapter 1: Chemical Reaction and Equations

Q1: When magnesium ribbon burns in air, it produces –
✅ Correct Answer: Magnesium oxide
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Q2: Magnesium ribbon burns with –
✅ Correct Answer: Dazzling white flame
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Q3: Which of the following is not an indicator of chemical reaction?
✅ Correct Answer: Change in shape only
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Q4: Potassium iodide solution + lead nitrate solution gives –
✅ Correct Answer: Yellow ppt
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Q5: The yellow precipitate formed is of –
✅ Correct Answer: Lead iodide
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Q6: Zinc reacts with dilute sulphuric acid and forms –
✅ Correct Answer: Zinc sulphate + H₂
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Q7: Which gas evolves when zinc reacts with H₂SO₄?
✅ Correct Answer: Hydrogen
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Q8: The word equation for burning of magnesium –
✅ Correct Answer: Magnesium + Oxygen → Magnesium oxide
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Q9: Law followed in balancing chemical equations is –
✅ Correct Answer: Law of conservation of mass
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Q10: Zn + H₂SO₄ → ?
✅ Correct Answer: ZnSO₄ + H₂
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Q11: In equation Fe + H₂O → Fe₃O₄ + H₂, balancing O requires –
✅ Correct Answer: 4 H₂O
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Q12: Balanced equation is –
✅ Correct Answer: 3Fe + 4H₂O → Fe₃O₄ + 4H₂
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Q13: In above balanced equation, water is in the form of –
✅ Correct Answer: Steam
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Q14: Symbol (aq) means –
✅ Correct Answer: Aqueous solution
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Q15: Which one represents glucose formation in plants?
✅ Correct Answer: 6CO₂ + 12H₂O → C₆H₁₂O₆ + 6O₂ + 6H₂O
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Q16: Which factor is essential for photosynthesis?
✅ Correct Answer: Sunlight and chlorophyll
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Q17: Symbol (s) in equation stands for –
✅ Correct Answer: Solid
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Q18: In CO + 2H₂ → CH₃OH, pressure applied is –
✅ Correct Answer: 340 atm
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Q19: Which of the following statements is correct?
I. A balanced equation obeys law of conservation of mass.
II. Skeletal equations are always balanced.
III. Photosynthesis needs sunlight and chlorophyll.
✅ Correct Answer: I and III
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Q20: Identify the correct statements –
I. Magnesium + Oxygen → Magnesium oxide is a word equation.
II. Mg + O₂ → MgO is a skeletal equation.
III. 2Mg + O₂ → 2MgO is a balanced equation.
✅ Correct Answer: I, II and III
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Q21: Choose the incorrect statement –
I. In Activity 1.3, hydrogen gas is evolved.
II. The flask becomes cold in Activity 1.3.
III. Zinc reacts with dilute H₂SO₄ to form ZnSO₄.
✅ Correct Answer: Only II
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Q22: Assertion (A): A chemical equation must be balanced.
Reason (R): It is based on law of conservation of mass.
✅ Correct Answer: A and R both true, R explains A
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Q23: Assertion (A): Symbol (aq) means aqueous solution.
Reason (R): The substance is dissolved in alcohol.
✅ Correct Answer: A true, R false
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Q24: Assertion (A): In the reaction 3Fe + 4H₂O → Fe₃O₄ + 4H₂, water is taken in steam form.
Reason (R): Steam reacts with iron to form Fe₃O₄ and H₂.
✅ Correct Answer: A and R both true, R explains A
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Q25: A skeletal equation is always balanced.
✅ Correct Answer: False
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Q26: In Activity 1.2, a yellow precipitate of lead iodide is formed.
✅ Correct Answer: True
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Q27: Photosynthesis does not require sunlight.
✅ Correct Answer: False
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Q28: When magnesium ribbon burns in air, it produces:
✅ Correct Answer: Magnesium oxide
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Q29: Why should magnesium ribbon be cleaned before burning?
✅ Correct Answer: To remove oxide layer
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Q30: The reaction: H₂ + Cl₂ → 2HCl is an example of –
✅ Correct Answer: Combination reaction
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Q31: Which of the following is a decomposition reaction?
✅ Correct Answer: CaCO₃ → CaO + CO₂
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Q32: Quicklime is –
✅ Correct Answer: CaO
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Q33: Slaked lime is –
✅ Correct Answer: Ca(OH)₂
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Q34: The reaction of calcium oxide with water is –
✅ Correct Answer: Exothermic
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Q35: White washing of walls uses –
✅ Correct Answer: Both Ca(OH)₂ and CaCO₃
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Q36: Which gas turns lime water milky?
✅ Correct Answer: CO₂
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Q37: The product formed on white washing after few days is –
✅ Correct Answer: CaCO₃
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Q38: Reaction of carbon with oxygen: C + O₂ → CO₂ is –
✅ Correct Answer: Combination
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Q39: Burning of natural gas is –
✅ Correct Answer: Exothermic
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Q40: Respiration is –
✅ Correct Answer: Exothermic
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Q41: Reaction: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Energy is –
✅ Correct Answer: Respiration
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Q42: The colour of ferrous sulphate crystals is –
✅ Correct Answer: Green
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Q43: On heating ferrous sulphate, the residue is –
✅ Correct Answer: Fe₂O₃
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Q44: Brown fumes on heating lead nitrate are due to –
✅ Correct Answer: NO₂
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Q45: Decomposition of lead nitrate gives –
✅ Correct Answer: PbO + NO₂ + O₂
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Q46: Electrolysis of water gives –
✅ Correct Answer: H₂ + O₂
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Q47: Which gas is collected double during electrolysis of water?
✅ Correct Answer: H₂
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Q48: The colour of silver chloride is –
✅ Correct Answer: White
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Q49: On exposure to sunlight, AgCl turns –
✅ Correct Answer: Grey
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Q50: Decomposition of AgCl is a –
✅ Correct Answer: Photochemical decomposition
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Q51: Which reaction is used in black & white photography?
✅ Correct Answer: Decomposition of AgCl
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Q52: When iron is dipped in CuSO₄ solution, the colour of solution fades because –
✅ Correct Answer: Cu forms
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Q53: The reaction Fe + CuSO₄ → FeSO₄ + Cu is –
✅ Correct Answer: Displacement
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Q54: Zn + CuSO₄ → ZnSO₄ + Cu is –
✅ Correct Answer: Displacement
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Q55: The reaction Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl is –
✅ Correct Answer: Double displacement
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Q56: The white precipitate formed in Na₂SO₄ + BaCl₂ reaction is –
✅ Correct Answer: BaSO₄
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Q57: Reaction producing insoluble salt is called –
✅ Correct Answer: Precipitation
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Q58: Oxidation is defined as –
✅ Correct Answer: Gain of oxygen / loss of hydrogen
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Q59: Reduction is –
✅ Correct Answer: Loss of oxygen / gain of hydrogen
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Q60: When copper is heated in air it forms –
✅ Correct Answer: CuO
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Q61: In CuO + H₂ → Cu + H₂O, the oxidizing agent is –
✅ Correct Answer: CuO
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Q62: In the same reaction, the reducing agent is –
✅ Correct Answer: H₂
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Q63: Corrosion of iron is called –
✅ Correct Answer: Rusting
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Q64: Rust mainly contains –
✅ Correct Answer: Fe₂O₃·xH₂O
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Q65: Black coating on silver is due to –
✅ Correct Answer: Ag₂S
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Q66: Green coating on copper is due to –
✅ Correct Answer: CuCO₃·Cu(OH)₂
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Q67: Rancidity in food is due to –
✅ Correct Answer: Oxidation
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Q68: Chips packets are flushed with –
✅ Correct Answer: Nitrogen
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Q69: Which of the following is an exothermic reaction?
✅ Correct Answer: All of these
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Q70: Photosynthesis is –
✅ Correct Answer: Endothermic
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Q71: Which reaction needs sunlight?
✅ Correct Answer: 2AgCl → 2Ag + Cl₂
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Q72: Which is NOT a displacement reaction?
✅ Correct Answer: CaCO₃ → CaO + CO₂
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Q73: Double displacement reactions often produce –
✅ Correct Answer: All of these
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Q74: Neutralization is a type of –
✅ Correct Answer: Double displacement reaction
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Q75: In the reaction 2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂, the brown fumes are –
✅ Correct Answer: NO₂
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Q76: Which reaction is both oxidation and reduction?
✅ Correct Answer: Redox reaction
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Q77: Respiration is a –
✅ Correct Answer: Catabolic reaction
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Q78: Photosynthesis is –
✅ Correct Answer: Anabolic
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Q79: Which one prevents rancidity?
✅ Correct Answer: Antioxidants
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Q80: Oxidizing agent is the substance which –
✅ Correct Answer: Gets reduced
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Q81: Reducing agent is the substance which –
✅ Correct Answer: Gets oxidized
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Q82: Which of the following represents a redox reaction?
✅ Correct Answer: CuO + H₂ → Cu + H₂O
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Q83: Assertion (A): Respiration is an exothermic process.
Reason (R): It releases energy by oxidation of glucose.
✅ Correct Answer: Both A and R true, R explains A
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Q84: Assertion (A): Photosynthesis is a photochemical reaction.
Reason (R): It occurs only in dark.
✅ Correct Answer: A true, R false
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Q85: Assertion (A): Corrosion of iron is called rusting.
Reason (R): It forms hydrated ferric oxide.
✅ Correct Answer: Both A and R true, R explains A
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Q86: Assertion (A): CaO + H₂O → Ca(OH)₂ is endothermic.
Reason (R): It absorbs heat.
✅ Correct Answer: Both A and R false
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Q87: Assertion (A): Electrolysis of water gives H₂ and O₂.
Reason (R): Water decomposes into hydrogen and oxygen on passing electric current.
✅ Correct Answer: Both A and R true, R explains A
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Q88: Which of the following are exothermic reactions?
(i) Burning of fuel
(ii) Respiration
(iii) Photosynthesis
✅ Correct Answer: Only i and ii
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Q89: Which of the following are displacement reactions?
(i) Fe + CuSO₄ → FeSO₄ + Cu
(ii) CaCO₃ → CaO + CO₂
(iii) Zn + CuSO₄ → ZnSO₄ + Cu
✅ Correct Answer: i and iii
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Q90: Which statements are correct?
(i) AgCl turns grey in sunlight
(ii) Decomposition of CaCO₃ is a thermal decomposition
(iii) Respiration is endothermic
✅ Correct Answer: i and ii
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Q91: Which are redox reactions?
(i) CuO + H₂ → Cu + H₂O
(ii) Zn + CuSO₄ → ZnSO₄ + Cu
(iii) NaOH + HCl → NaCl + H₂O
✅ Correct Answer: i and ii
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Q92: Which reactions are photochemical decomposition?
(i) AgCl → Ag + Cl₂
(ii) AgBr → Ag + Br₂
(iii) CaCO₃ → CaO + CO₂
✅ Correct Answer: i and ii
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Q93: Respiration is an endothermic reaction.
✅ Correct Answer: False
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Q94: Quicklime reacts vigorously with water to form slaked lime.
✅ Correct Answer: True
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Q95: Silver chloride turns white on exposure to sunlight.
✅ Correct Answer: False
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Q96: Green coating on copper is due to basic copper carbonate.
✅ Correct Answer: True
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Q97: Photosynthesis is an exothermic reaction.
✅ Correct Answer: False
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Q98: Which of the following is not a physical change?
✅ Correct Answer: Rusting of iron
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Q99: Which of the following represents a displacement reaction?
✅ Correct Answer: Zn + CuSO₄ → ZnSO₄ + Cu
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Q100: Decomposition of calcium carbonate on heating gives –
✅ Correct Answer: CaO + CO₂
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Q101: Which gas is produced when hydrochloric acid reacts with zinc?
✅ Correct Answer: Hydrogen
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Q102: The reaction between acid and base to form salt and water is known as –
✅ Correct Answer: Neutralisation reaction
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Q103: The reaction in which two or more substances combine to form a single product is called –
✅ Correct Answer: Combination reaction
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Q104: Which of the following is a double displacement reaction?
✅ Correct Answer: AgNO₃ + NaCl → AgCl + NaNO₃
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Q105: The chemical change that results in gain of oxygen is called –
✅ Correct Answer: Oxidation
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Q106: Which of the following is used to prevent rusting of iron?
✅ Correct Answer: All of these
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Q107: Which of the following represents a redox reaction?
✅ Correct Answer: All of these
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Q108: Consider the following statements:
✅ Correct Answer: I and II are correct
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Q109: Consider the following statements:
✅ Correct Answer: I and II are correct
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Q110: Consider the following statements:
✅ Correct Answer: All three are correct
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Q111: Assertion (A): Magnesium ribbon burns in air with a dazzling white flame.
✅ Correct Answer: Both A and R are true, and R is the correct explanation of A
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Q112: Assertion (A): Hydrogen gas is evolved when Zn reacts with HCl.
✅ Correct Answer: A is true but R is false
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Q113: Assertion (A): Neutralisation reactions are exothermic in nature.
✅ Correct Answer: Both A and R are true, and R is the correct explanation of A
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Q114: Combustion of magnesium is a decomposition reaction.
✅ Correct Answer: False
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Q115: In redox reaction, oxidation and reduction occur simultaneously.
✅ Correct Answer: True
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Q116: The reaction between silver nitrate and sodium chloride is an example of a displacement reaction.
✅ Correct Answer: False (It is double displacement reaction)
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Q117: Which type of reaction is respiration in living beings?
✅ Correct Answer: Exothermic
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Q118: Which of the following is an example of decomposition reaction?
✅ Correct Answer: Electrolysis of water
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Q119: The chemical reaction between quicklime and water produces:
✅ Correct Answer: Ca(OH)₂ and heat
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Q120: Which one of the following is not a characteristic of a chemical change?
✅ Correct Answer: Reversibility of reaction
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Q121: Which of the following is used in black-and-white photography?
✅ Correct Answer: Silver chloride
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Q122: Which reaction is represented by the process of photosynthesis?
✅ Correct Answer: Endothermic combination
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Q123: Which among the following reactions is endothermic?
✅ Correct Answer: Decomposition of CaCO₃
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Q124: Which chemical is used to test the presence of CO₂?
✅ Correct Answer: Lime water
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Q125: A balanced chemical equation must satisfy which of the following?
✅ Correct Answer: Law of conservation of mass
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Q126: The reaction of ferrous sulphate crystals on heating gives:
✅ Correct Answer: Fe₂O₃, SO₂ and SO₃
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Q127: Simplest form of writing a reaction is:
✅ Correct Answer: Skeletal equation
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Q128: A skeletal equation is:
✅ Correct Answer: Unbalanced
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Class 10 Science chapterwise MCQs

"Practicing chapter-wise MCQs regularly is the best way to prepare for the upcoming HSLC Class 10 (SEBA) exams. These MCQs help you revise important concepts, formulas, definitions, and key points from each chapter quickly. Always try to solve in a timed manner to improve speed and accuracy. On porhahuna, you will find well-structured MCQs that make your preparation easier, reduce exam stress, and boost your confidence to score higher marks."

🧪 Science Exam Tips – HSLC 2026 (SEBA Class 10)

📌 Final Tip: Consistent practice of Science objective-type questions is the smartest way to secure high marks in HSLC 2026 (SEBA).

🔎 Frequently Asked Questions – Class 10 Science (SEBA)

Q1: How can I score good marks in Class 10 SEBA Science?

👉 Focus on understanding concepts, practice diagrams, revise formulas and equations, and solve daily MCQs from each chapter.

Q2: Are NCERT/SEBA textbooks enough for HSLC 2026 Science exam?

👉 Yes. Around 60% of questions come directly from SEBA textbooks, so thorough revision of exercises and activities is essential.

Q3: How important are diagrams in Science exam?

👉 Very important. Diagrams like plant cell, human heart, and circuit diagrams are frequently asked in both MCQs and long answers.

Q4: Should I practice only MCQs for Science?

👉 No. Along with MCQs, also revise short and long answers to strengthen conceptual clarity for the exam.

Q5: What is the best daily routine for Science exam preparation?

👉 Revise one topic, write key formulas/reactions, practice a few diagrams, and solve at least 15–20 MCQs daily.

📝 Exam Tips for Class 10 (SEBA) Students

👉 Remember, regular MCQ practice on porhahuna will make your HSLC exam preparation strong and stress-free.

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Conclusion

Practicing SEBA Class 10 Science MCQs chapterwise is the best way to prepare for HSLC 2026 exam. Regular practice improves speed, accuracy, and confidence in answering objective questions.

Last Updated: September 03, 2025