1️⃣ Which of the following is a chemical change? 🔥
- A. Melting of ice
- B. Boiling of water
- C. Rusting of iron
- D. Breaking of glass
Show Answer 🔽
✅ C. Rusting of iron
2️⃣ Which of the following is not a type of chemical reaction? 🔄
- A. Combination reaction
- B. Decomposition reaction
- C. Photoelectric reaction
- D. Displacement reaction
Show Answer 🔽
✅ C. Photoelectric reaction
3️⃣ What is the color change observed when iron reacts with copper sulphate solution? 🧪
- A. Blue to green
- B. Green to red
- C. Colorless to red
- D. Yellow to brown
Show Answer 🔽
✅ A. Blue to green
4️⃣ The equation Zn + H₂SO₄ → ZnSO₄ + H₂ is an example of: ⚗️
- A. Combination reaction
- B. Displacement reaction
- C. Decomposition reaction
- D. Double displacement reaction
Show Answer 🔽
✅ B. Displacement reaction
5️⃣ Which of these is a balanced chemical equation? ⚖️
- A. H₂ + O₂ → H₂O
- B. Na + Cl₂ → NaCl
- C. 2H₂ + O₂ → 2H₂O
- D. C + O₂ → CO
Show Answer 🔽
✅ C. 2H₂ + O₂ → 2H₂O
6️⃣ Which reaction is used in black and white photography? 📸
- A. Combination reaction
- B. Decomposition reaction
- C. Displacement reaction
- D. Double displacement reaction
Show Answer 🔽
✅ B. Decomposition reaction
7️⃣ The reaction CaCO₃ → CaO + CO₂ is: 🔥
- A. Combination reaction
- B. Displacement reaction
- C. Decomposition reaction
- D. Neutralization reaction
Show Answer 🔽
✅ C. Decomposition reaction
8️⃣ What type of reaction is involved in the formation of a precipitate? ⚗️
- A. Decomposition
- B. Displacement
- C. Double displacement
- D. Combination
Show Answer 🔽
✅ C. Double displacement
9️⃣ The brown coating formed on iron due to corrosion is: 🧲
- A. FeCl₃
- B. Fe₂O₃
- C. FeSO₄
- D. FeO
Show Answer 🔽
✅ B. Fe₂O₃
🔟 What is a displacement reaction? 🔁
- A. Two elements combine
- B. One element replaces another in a compound
- C. One compound splits into elements
- D. Acid reacts with base
Show Answer 🔽
✅ B. One element replaces another in a compound
1️⃣1️⃣ What is the chemical formula for quicklime? 🧪
- A. Ca(OH)₂
- B. CaCO₃
- C. CaO
- D. CaCl₂
Show Answer 🔽
✅ C. CaO
1️⃣2️⃣ Which of the following is a redox reaction? 🔄
- A. NaOH + HCl → NaCl + H₂O
- B. Zn + CuSO₄ → ZnSO₄ + Cu
- C. CaO + H₂O → Ca(OH)₂
- D. BaCl₂ + Na₂SO₄ → BaSO₄ + NaCl
Show Answer 🔽
✅ B. Zn + CuSO₄ → ZnSO₄ + Cu
1️⃣3️⃣ What happens when dilute hydrochloric acid is added to zinc granules? ⚗️
- A. Green gas is evolved
- B. Hydrogen gas is evolved
- C. Oxygen gas is evolved
- D. White precipitate is formed
Show Answer 🔽
✅ B. Hydrogen gas is evolved
1️⃣4️⃣ What is formed when lead nitrate is heated? 🔥
- A. Lead oxide + Nitrogen dioxide + Oxygen
- B. Lead sulphate + Water
- C. Lead chloride + Nitrogen
- D. Lead nitrate remains unchanged
Show Answer 🔽
✅ A. Lead oxide + Nitrogen dioxide + Oxygen
1️⃣5️⃣ Which of the following is NOT a characteristic of a chemical reaction? ❌
- A. Evolution of gas
- B. Change in temperature
- C. Change in state
- D. Boiling of water
Show Answer 🔽
✅ D. Boiling of water
1️⃣6️⃣ The reaction between acid and base to form salt and water is called: ⚖️
- A. Displacement reaction
- B. Precipitation reaction
- C. Neutralization reaction
- D. Combination reaction
Show Answer 🔽
✅ C. Neutralization reaction
1️⃣7️⃣ Which of these represents thermal decomposition? 🔥
- A. 2KClO₃ → 2KCl + 3O₂
- B. Zn + HCl → ZnCl₂ + H₂
- C. AgNO₃ + NaCl → AgCl + NaNO₃
- D. HCl + NaOH → NaCl + H₂O
Show Answer 🔽
✅ A. 2KClO₃ → 2KCl + 3O₂
1️⃣8️⃣ The reaction between iron and copper sulphate solution is: 🧲
- A. Combination reaction
- B. Decomposition reaction
- C. Displacement reaction
- D. Neutralization reaction
Show Answer 🔽
✅ C. Displacement reaction
1️⃣9️⃣ Which type of chemical reaction is used in the manufacture of ammonia? 🧪
- A. Decomposition
- B. Combination
- C. Displacement
- D. Double displacement
Show Answer 🔽
✅ B. Combination
2️⃣0️⃣ Which chemical is used to test the presence of carbon dioxide? 🧫
- A. Limewater
- B. Baking soda
- C. Hydrochloric acid
- D. Alcohol
Show Answer 🔽
✅ A. Limewater
2️⃣1️⃣ Which of the following reactions is exothermic? 🔥
- A. NH₄Cl → NH₃ + HCl
- B. CaO + H₂O → Ca(OH)₂
- C. 2AgCl → 2Ag + Cl₂
- D. Ba(OH)₂ + NH₄Cl → NH₃
Show Answer 🔽
✅ B. CaO + H₂O → Ca(OH)₂
2️⃣2️⃣ What is the color of copper sulphate solution? 🔷
- A. Green
- B. Yellow
- C. Blue
- D. Red
Show Answer 🔽
✅ C. Blue
2️⃣3️⃣ The product of the reaction between acid and metal carbonate is: 💨
- A. Hydrogen gas
- B. Oxygen gas
- C. Carbon dioxide gas
- D. Nitrogen gas
Show Answer 🔽
✅ C. Carbon dioxide gas
2️⃣4️⃣ What is the balanced equation for the formation of water from hydrogen and oxygen? 💧
- A. H₂ + O₂ → H₂O
- B. 2H₂ + O₂ → 2H₂O
- C. H₂ + 2O₂ → 2H₂O
- D. 2H₂O → H₂ + O₂
Show Answer 🔽
✅ B. 2H₂ + O₂ → 2H₂O
2️⃣5️⃣ Which chemical change is represented by the reaction of vinegar and baking soda? 🧼
- A. Combustion
- B. Endothermic reaction
- C. Acid-base neutralization
- D. Decomposition
Show Answer 🔽
✅ C. Acid-base neutralization
2️⃣6️⃣ The gas evolved during the thermal decomposition of calcium carbonate is: 🌫️
- A. Oxygen
- B. Nitrogen
- C. Carbon dioxide
- D. Hydrogen
Show Answer 🔽
✅ C. Carbon dioxide
2️⃣7️⃣ What kind of reaction is 2KBr + Cl₂ → 2KCl + Br₂? 🔄
- A. Combination
- B. Displacement
- C. Decomposition
- D. Neutralization
Show Answer 🔽
✅ B. Displacement
2️⃣8️⃣ In which reaction does an element replace another element from its compound? 🔁
- A. Double displacement
- B. Neutralization
- C. Displacement
- D. Decomposition
Show Answer 🔽
✅ C. Displacement
2️⃣9️⃣ In a balanced chemical equation, mass is: ⚖️
- A. Created
- B. Destroyed
- C. Equal on both sides
- D. Lost as energy
Show Answer 🔽
✅ C. Equal on both sides
3️⃣0️⃣ Which of the following is a physical change? ❄️
- A. Melting of ice
- B. Rusting of iron
- C. Burning of coal
- D. Cooking of food
Show Answer 🔽
✅ A. Melting of ice
3️⃣1️⃣ Which metal reacts with dilute HCl to liberate hydrogen gas? ⚗️
- A. Copper
- B. Silver
- C. Zinc
- D. Gold
Show Answer 🔽
✅ C. Zinc
3️⃣2️⃣ Which of the following is an endothermic reaction? ❄️
- A. Combustion of fuel
- B. Photosynthesis
- C. Neutralization
- D. Rusting of iron
Show Answer 🔽
✅ B. Photosynthesis
3️⃣3️⃣ What happens when silver chloride is kept in sunlight? 🌞
- A. Turns green
- B. Turns grey
- C. Becomes black
- D. Remains white
Show Answer 🔽
✅ B. Turns grey
3️⃣4️⃣ A reaction in which heat is released is called: 🔥
- A. Endothermic reaction
- B. Exothermic reaction
- C. Physical reaction
- D. Reversible reaction
Show Answer 🔽
✅ B. Exothermic reaction
3️⃣5️⃣ The law of conservation of mass is obeyed in: ⚖️
- A. Only physical changes
- B. Only chemical changes
- C. Both physical and chemical changes
- D. Only nuclear changes
Show Answer 🔽
✅ C. Both physical and chemical changes
3️⃣6️⃣ What does the arrow (→) in a chemical equation represent? ➡️
- A. Equal to
- B. Direction of reaction
- C. Opposite reaction
- D. Heat absorbed
Show Answer 🔽
✅ B. Direction of reaction
3️⃣7️⃣ What is observed when magnesium ribbon burns in air? 🔥
- A. A white powder is formed
- B. A black residue is formed
- C. Brown gas is evolved
- D. Green flame is seen
Show Answer 🔽
✅ A. A white powder is formed
3️⃣8️⃣ Which of these is a chemical change? 🔄
- A. Melting wax
- B. Freezing water
- C. Burning of paper
- D. Boiling water
Show Answer 🔽
✅ C. Burning of paper
3️⃣9️⃣ The decomposition of water into hydrogen and oxygen is caused by: ⚡
- A. Light
- B. Heat
- C. Electricity
- D. Pressure
Show Answer 🔽
✅ C. Electricity
4️⃣0️⃣ What type of change is electrolysis of water? 💧
- A. Physical
- B. Chemical
- C. Biological
- D. Environmental
Show Answer 🔽
✅ B. Chemical
4️⃣1️⃣ Which of the following is a combination reaction? ➕
- A. CaO + H₂O → Ca(OH)₂
- B. Zn + HCl → ZnCl₂ + H₂
- C. AgNO₃ + NaCl → AgCl + NaNO₃
- D. Pb(NO₃)₂ → PbO + NO₂ + O₂
Show Answer 🔽
✅ A. CaO + H₂O → Ca(OH)₂
4️⃣2️⃣ A brown coating on iron is an indication of: 🧲
- A. Reduction
- B. Fermentation
- C. Corrosion
- D. Sublimation
Show Answer 🔽
✅ C. Corrosion
4️⃣3️⃣ Which gas turns limewater milky? 🫧
- A. Hydrogen
- B. Carbon dioxide
- C. Oxygen
- D. Nitrogen
Show Answer 🔽
✅ B. Carbon dioxide
4️⃣4️⃣ The chemical reaction involved in respiration is: 🫁
- A. Combination
- B. Exothermic
- C. Oxidation
- D. All of the above
Show Answer 🔽
✅ D. All of the above
4️⃣5️⃣ What happens to the mass during a chemical reaction? ⚖️
- A. It increases
- B. It decreases
- C. It remains the same
- D. It doubles
Show Answer 🔽
✅ C. It remains the same
4️⃣6️⃣ Which is an example of oxidation? 🧪
- A. Rusting of iron
- B. Burning of magnesium
- C. Respiration
- D. All of these
Show Answer 🔽
✅ D. All of these
4️⃣7️⃣ The process of adding oxygen to a substance is called: 💨
- A. Reduction
- B. Oxidation
- C. Combustion
- D. Neutralization
Show Answer 🔽
✅ B. Oxidation
4️⃣8️⃣ In redox reactions, which two processes occur? 🔄
- A. Boiling and melting
- B. Oxidation and reduction
- C. Burning and freezing
- D. Neutralization and combination
Show Answer 🔽
✅ B. Oxidation and reduction
4️⃣9️⃣ Which reaction shows double displacement? 🔁
- A. Zn + HCl → ZnCl₂ + H₂
- B. Pb(NO₃)₂ + KI → PbI₂ + KNO₃
- C. 2H₂ + O₂ → 2H₂O
- D. 2KClO₃ → 2KCl + 3O₂
Show Answer 🔽
✅ B. Pb(NO₃)₂ + KI → PbI₂ + KNO₃
5️⃣0️⃣ Which metal does not react with dilute acids? 🚫
- A. Magnesium
- B. Zinc
- C. Copper
- D. Iron
Show Answer 🔽
✅ C. Copper
5️⃣1️⃣ Which of the following is not a sign of a chemical reaction? ❌
- A. Change in color
- B. Formation of precipitate
- C. Evolution of gas
- D. Dissolving of salt in water
Show Answer 🔽
✅ D. Dissolving of salt in water
5️⃣2️⃣ The process in which a substance gains oxygen is called: 💨
- A. Oxidation
- B. Reduction
- C. Neutralization
- D. Precipitation
Show Answer 🔽
✅ A. Oxidation
5️⃣3️⃣ What is the chemical formula of limewater? 🧪
- A. CaCO₃
- B. CaCl₂
- C. Ca(OH)₂
- D. CaSO₄
Show Answer 🔽
✅ C. Ca(OH)₂
5️⃣4️⃣ Which of the following is a precipitation reaction? 🌧️
- A. Zn + CuSO₄ → ZnSO₄ + Cu
- B. BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl
- C. 2H₂ + O₂ → 2H₂O
- D. NaOH + HCl → NaCl + H₂O
Show Answer 🔽
✅ B. BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl
5️⃣5️⃣ Which of the following will not decompose on heating? 🔥
- A. CaCO₃
- B. NaCl
- C. Pb(NO₃)₂
- D. ZnCO₃
Show Answer 🔽
✅ B. NaCl
5️⃣6️⃣ What is the product formed when sulphur burns in air? 🔥
- A. SO₂
- B. SO₃
- C. H₂S
- D. CO₂
Show Answer 🔽
✅ A. SO₂
5️⃣7️⃣ The process of loss of electrons is known as: ➖
- A. Reduction
- B. Neutralization
- C. Oxidation
- D. Decomposition
Show Answer 🔽
✅ C. Oxidation
5️⃣8️⃣ What is the product of the thermal decomposition of ferrous sulphate? 🧪
- A. Fe + SO₂ + O₂
- B. Fe₂O₃ + SO₂ + SO₃
- C. FeO + S
- D. Fe₂O₃ + CO₂
Show Answer 🔽
✅ B. Fe₂O₃ + SO₂ + SO₃
5️⃣9️⃣ What kind of change is cooking of food? 🍲
- A. Physical
- B. Chemical
- C. Temporary
- D. Reversible
Show Answer 🔽
✅ B. Chemical
6️⃣0️⃣ Which of the following is a displacement reaction? 🔁
- A. CuSO₄ + Fe → FeSO₄ + Cu
- B. AgNO₃ + NaCl → AgCl + NaNO₃
- C. HCl + NaOH → NaCl + H₂O
- D. H₂ + Cl₂ → 2HCl
Show Answer 🔽
✅ A. CuSO₄ + Fe → FeSO₄ + Cu
6️⃣1️⃣ Which element is most reactive in displacement reactions? ⚛️
- A. Silver
- B. Copper
- C. Iron
- D. Potassium
Show Answer 🔽
✅ D. Potassium
6️⃣2️⃣ What is the chemical symbol for lead? 🔤
- A. Pb
- B. Pd
- C. P
- D. Ld
Show Answer 🔽
✅ A. Pb
6️⃣3️⃣ In the reaction: CuO + H₂ → Cu + H₂O, which substance is reduced? 🔄
- A. CuO
- B. H₂
- C. Cu
- D. H₂O
Show Answer 🔽
✅ A. CuO
6️⃣4️⃣ What is the name of the compound formed by Na and Cl? 🧂
- A. Sodium hydroxide
- B. Sodium carbonate
- C. Sodium chloride
- D. Sodium nitrate
Show Answer 🔽
✅ C. Sodium chloride
6️⃣5️⃣ What does a precipitate look like in a reaction? 🌫️
- A. A gas bubble
- B. A colored flame
- C. An insoluble solid
- D. A clear liquid
Show Answer 🔽
✅ C. An insoluble solid
6️⃣6️⃣ Which gas is evolved when acid reacts with metal? 💨
- A. Oxygen
- B. Hydrogen
- C. Carbon dioxide
- D. Nitrogen
Show Answer 🔽
✅ B. Hydrogen
6️⃣7️⃣ The brown gas evolved on heating lead nitrate is: ☁️
- A. CO₂
- B. NO₂
- C. NH₃
- D. SO₂
Show Answer 🔽
✅ B. NO₂
6️⃣8️⃣ Which reaction is photochemical? 📸
- A. 2H₂ + O₂ → 2H₂O
- B. AgCl → Ag + Cl₂
- C. CaCO₃ → CaO + CO₂
- D. Zn + HCl → ZnCl₂ + H₂
Show Answer 🔽
✅ B. AgCl → Ag + Cl₂
6️⃣9️⃣ What happens when magnesium reacts with steam? 💧
- A. Hydrogen gas is evolved
- B. Water freezes
- C. No reaction occurs
- D. Oxygen is released
Show Answer 🔽
✅ A. Hydrogen gas is evolved
7️⃣0️⃣ What is the result of rusting on iron? 🧲
- A. Increase in strength
- B. Hard coating
- C. Formation of reddish-brown substance
- D. Weight loss
Show Answer 🔽
✅ C. Formation of reddish-brown substance
7️⃣1️⃣ What happens when CO₂ is passed through limewater for a long time? 🫧
- A. Turns limewater milky
- B. Milky solution becomes clear
- C. Forms reddish-brown gas
- D. No change
Show Answer 🔽
✅ B. Milky solution becomes clear
7️⃣2️⃣ What is the product formed when magnesium reacts with hydrochloric acid? ⚗️
- A. MgCl₂ + H₂
- B. MgO + H₂
- C. MgOH + H₂
- D. MgCl₂ + H₂O
Show Answer 🔽
✅ A. MgCl₂ + H₂
7️⃣3️⃣ In redox reactions, the species that loses electrons is: ➖
- A. Reduced
- B. Oxidized
- C. Neutral
- D. Inert
Show Answer 🔽
✅ B. Oxidized
7️⃣4️⃣ Which type of reaction is involved in fireworks? 🎆
- A. Displacement
- B. Combination
- C. Decomposition
- D. Exothermic
Show Answer 🔽
✅ D. Exothermic
7️⃣5️⃣ Which gas is produced when acid reacts with metal carbonates? 💨
- A. Oxygen
- B. Hydrogen
- C. Carbon dioxide
- D. Chlorine
Show Answer 🔽
✅ C. Carbon dioxide
7️⃣6️⃣ What happens when an iron nail is placed in copper sulphate solution? 🧲
- A. Iron dissolves
- B. Copper deposits on iron
- C. No reaction
- D. Iron turns blue
Show Answer 🔽
✅ B. Copper deposits on iron
7️⃣7️⃣ The reaction Ca(OH)₂ + CO₂ → CaCO₃ + H₂O is used to test for: 🌫️
- A. O₂
- B. N₂
- C. CO₂
- D. H₂
Show Answer 🔽
✅ C. CO₂
7️⃣8️⃣ What type of reaction is HCl + NaOH → NaCl + H₂O? ⚖️
- A. Neutralization
- B. Combination
- C. Decomposition
- D. Redox
Show Answer 🔽
✅ A. Neutralization
7️⃣9️⃣ Silver articles turn black due to formation of: 🖤
- A. AgNO₃
- B. Ag₂S
- C. AgCl
- D. Ag₂O
Show Answer 🔽
✅ B. Ag₂S
8️⃣0️⃣ Which of these is not a redox reaction? ❌
- A. Combustion
- B. Displacement
- C. Decomposition
- D. Precipitation
Show Answer 🔽
✅ D. Precipitation
8️⃣1️⃣ The reaction of CaCO₃ → CaO + CO₂ is called: 🔥
- A. Combination
- B. Decomposition
- C. Double displacement
- D. Neutralization
Show Answer 🔽
✅ B. Decomposition
8️⃣2️⃣ What is the role of heat in thermal decomposition? 🔥
- A. Stops the reaction
- B. Combines elements
- C. Breaks down compounds
- D. Cools the products
Show Answer 🔽
✅ C. Breaks down compounds
8️⃣3️⃣ In which reaction does one compound split into two or more substances? 🔄
- A. Combination
- B. Displacement
- C. Decomposition
- D. Redox
Show Answer 🔽
✅ C. Decomposition
8️⃣4️⃣ What is rust chemically? 🧪
- A. FeSO₄
- B. Fe₂O₃·xH₂O
- C. FeCl₂
- D. Fe(OH)₂
Show Answer 🔽
✅ B. Fe₂O₃·xH₂O
8️⃣5️⃣ In the reaction: MnO₂ + HCl → MnCl₂ + Cl₂ + H₂O, which is the oxidizing agent? ⚗️
- A. MnO₂
- B. HCl
- C. MnCl₂
- D. Cl₂
Show Answer 🔽
✅ A. MnO₂
8️⃣6️⃣ What is observed when lead nitrate is heated? 🌫️
- A. White gas
- B. Brown gas
- C. Green gas
- D. Colorless gas
Show Answer 🔽
✅ B. Brown gas
8️⃣7️⃣ Which of these is an example of oxidation? 🔥
- A. Melting of wax
- B. Freezing of water
- C. Rusting of iron
- D. Evaporation of alcohol
Show Answer 🔽
✅ C. Rusting of iron
8️⃣8️⃣ What kind of change is digestion of food? 🍽️
- A. Physical
- B. Reversible
- C. Chemical
- D. Temporary
Show Answer 🔽
✅ C. Chemical
8️⃣9️⃣ Which reaction is used in silvering of mirrors? 🪞
- A. Combination
- B. Redox
- C. Decomposition
- D. Precipitation
Show Answer 🔽
✅ B. Redox
9️⃣0️⃣ Electrolysis of water gives: ⚡
- A. H₂ + O₂
- B. CO₂ + H₂
- C. H₂O + H₂
- D. O₂ only
Show Answer 🔽
✅ A. H₂ + O₂
9️⃣1️⃣ A reaction where energy is absorbed is: ❄️
- A. Exothermic
- B. Endothermic
- C. Neutralization
- D. Oxidation
Show Answer 🔽
✅ B. Endothermic
9️⃣2️⃣ Which process involves both oxidation and reduction? 🔄
- A. Neutralization
- B. Decomposition
- C. Redox
- D. Combination
Show Answer 🔽
✅ C. Redox
9️⃣3️⃣ Which gas has a pop sound when a burning splint is brought near? 🔥
- A. CO₂
- B. O₂
- C. H₂
- D. N₂
Show Answer 🔽
✅ C. H₂
9️⃣4️⃣ Heating of blue copper sulphate turns it: 🔵
- A. Green
- B. Black
- C. White
- D. Yellow
Show Answer 🔽
✅ C. White
9️⃣5️⃣ A reaction with light as a source of energy is: 💡
- A. Thermal decomposition
- B. Electrolysis
- C. Photochemical reaction
- D. Combination
Show Answer 🔽
✅ C. Photochemical reaction
9️⃣6️⃣ Silver chloride turns grey due to: ⚡
- A. Sunlight
- B. Air
- C. Water
- D. Heat
Show Answer 🔽
✅ A. Sunlight
9️⃣7️⃣ In redox reactions, oxidizing agent: 🧪
- A. Gains electrons
- B. Loses electrons
- C. Gets reduced
- D. Both A and C
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✅ D. Both A and C
9️⃣8️⃣ Which acid reacts with marble chips to produce CO₂? 🧱
- A. Nitric acid
- B. Hydrochloric acid
- C. Acetic acid
- D. Sulphuric acid
Show Answer 🔽
✅ B. Hydrochloric acid
9️⃣9️⃣ The reaction 2Fe + 3Cl₂ → 2FeCl₃ is: 🔄
- A. Combination
- B. Displacement
- C. Double displacement
- D. Neutralization
Show Answer 🔽
✅ A. Combination
💯 Which is not a chemical reaction? ❌
- A. Iron rusting
- B. Boiling of water
- C. Milk turning sour
- D. Burning of candle
Show Answer 🔽
✅ B. Boiling of water
