1️⃣ Which of the following is a strong acid? 🔥
- A. Acetic acid
- B. Citric acid
- C. Hydrochloric acid
- D. Carbonic acid
Show Answer 🔽
✅ C. Hydrochloric acid
2️⃣ Which base is used in antacids? 💊
- A. Sodium hydroxide
- B. Magnesium hydroxide
- C. Calcium hydroxide
- D. Ammonium hydroxide
Show Answer 🔽
✅ B. Magnesium hydroxide
3️⃣ The chemical formula of baking soda is: 🍪
- A. NaOH
- B. NaHCO₃
- C. Na₂CO₃
- D. NaCl
Show Answer 🔽
✅ B. NaHCO₃
4️⃣ Which acid is present in lemon? 🍋
- A. Tartaric acid
- B. Oxalic acid
- C. Citric acid
- D. Acetic acid
Show Answer 🔽
✅ C. Citric acid
5️⃣ What is formed when acid reacts with base? ⚖️
- A. Salt and water
- B. Salt and oxygen
- C. Hydrogen gas
- D. Only salt
Show Answer 🔽
✅ A. Salt and water
6️⃣ Which of the following is a natural indicator? 🌿
- A. Phenolphthalein
- B. Methyl orange
- C. Litmus
- D. Universal indicator
Show Answer 🔽
✅ C. Litmus
7️⃣ A base turns red litmus: 🧪
- A. Blue
- B. Green
- C. Yellow
- D. No change
Show Answer 🔽
✅ A. Blue
8️⃣ Which of the following is used to neutralize acid spills? 🚒
- A. Vinegar
- B. Baking soda
- C. Lemon juice
- D. Salt water
Show Answer 🔽
✅ B. Baking soda
9️⃣ Common salt is chemically known as: 🧂
- A. NaOH
- B. Na₂CO₃
- C. NaCl
- D. NaHCO₃
Show Answer 🔽
✅ C. NaCl
🔟 Which gas is evolved when acids react with metals? 💨
- A. Oxygen
- B. Nitrogen
- C. Carbon dioxide
- D. Hydrogen
Show Answer 🔽
✅ D. Hydrogen
1️⃣1️⃣ Which of the following is used to make soda ash? 🧼
- A. Baking soda
- B. Washing soda
- C. Bleaching powder
- D. Vinegar
Show Answer 🔽
✅ B. Washing soda
1️⃣2️⃣ What is the pH value of a neutral solution? ⚖️
- A. 0
- B. 7
- C. 14
- D. 1
Show Answer 🔽
✅ B. 7
1️⃣3️⃣ A solution with pH less than 7 is: 🔻
- A. Basic
- B. Neutral
- C. Acidic
- D. Salty
Show Answer 🔽
✅ C. Acidic
1️⃣4️⃣ Which acid is used in car batteries? 🚗
- A. Hydrochloric acid
- B. Acetic acid
- C. Nitric acid
- D. Sulphuric acid
Show Answer 🔽
✅ D. Sulphuric acid
1️⃣5️⃣ Which substance turns red litmus blue? 🔷
- A. Acid
- B. Salt
- C. Base
- D. Water
Show Answer 🔽
✅ C. Base
1️⃣6️⃣ Which compound is used in the manufacture of glass and soap? 🧼
- A. NaCl
- B. NaHCO₃
- C. Na₂CO₃
- D. CH₃COOH
Show Answer 🔽
✅ C. Na₂CO₃
1️⃣7️⃣ Which of the following is not an acid? ❌
- A. HCl
- B. H₂SO₄
- C. HNO₃
- D. NaOH
Show Answer 🔽
✅ D. NaOH
1️⃣8️⃣ What is formed when carbon dioxide is passed through limewater? 💨
- A. Calcium chloride
- B. Calcium carbonate
- C. Calcium bicarbonate
- D. Calcium hydroxide
Show Answer 🔽
✅ B. Calcium carbonate
1️⃣9️⃣ Which compound is known as caustic soda? 🧪
- A. NaCl
- B. NaHCO₃
- C. NaOH
- D. Na₂CO₃
Show Answer 🔽
✅ C. NaOH
2️⃣0️⃣ Bleaching powder is chemically: 🧴
- A. CaOCl₂
- B. CaCl₂
- C. Ca(OH)₂
- D. CaCO₃
Show Answer 🔽
✅ A. CaOCl₂
2️⃣1️⃣ Which acid is present in vinegar? 🍶
- A. Citric acid
- B. Tartaric acid
- C. Acetic acid
- D. Lactic acid
Show Answer 🔽
✅ C. Acetic acid
2️⃣2️⃣ A solution has a pH of 13. It is: 🧪
- A. Weak acid
- B. Strong acid
- C. Strong base
- D. Weak base
Show Answer 🔽
✅ C. Strong base
2️⃣3️⃣ The salt used to remove permanent hardness of water is: 💧
- A. Baking soda
- B. Washing soda
- C. Bleaching powder
- D. Caustic soda
Show Answer 🔽
✅ B. Washing soda
2️⃣4️⃣ Which of these is a weak acid? 🧪
- A. Sulphuric acid
- B. Acetic acid
- C. Hydrochloric acid
- D. Nitric acid
Show Answer 🔽
✅ B. Acetic acid
2️⃣5️⃣ Tooth decay starts when pH of mouth is: 🦷
- A. Above 7
- B. Equal to 7
- C. Below 5.5
- D. 8
Show Answer 🔽
✅ C. Below 5.5
2️⃣6️⃣ The acid used in pickling is: 🥒
- A. Nitric acid
- B. Hydrochloric acid
- C. Acetic acid
- D. Sulphuric acid
Show Answer 🔽
✅ C. Acetic acid
2️⃣7️⃣ Which is a household base? 🏠
- A. Hydrochloric acid
- B. Ammonium hydroxide
- C. Citric acid
- D. Sodium chloride
Show Answer 🔽
✅ B. Ammonium hydroxide
2️⃣8️⃣ Which salt is used for making borax? 🧴
- A. Sodium nitrate
- B. Sodium thiosulphate
- C. Sodium tetraborate
- D. Sodium carbonate
Show Answer 🔽
✅ C. Sodium tetraborate
2️⃣9️⃣ The nature of aqueous solution of NaOH is: 💦
- A. Acidic
- B. Basic
- C. Neutral
- D. Salty
Show Answer 🔽
✅ B. Basic
3️⃣0️⃣ Blue litmus paper turns red in: 🔴
- A. Neutral solution
- B. Acidic solution
- C. Basic solution
- D. Saline solution
Show Answer 🔽
✅ B. Acidic solution
3️⃣1️⃣ Which substance is used to prepare bleaching powder? 🧪
- A. Calcium oxide
- B. Quick lime
- C. Dry chlorine
- D. Slaked lime
Show Answer 🔽
✅ D. Slaked lime
3️⃣2️⃣ Which indicator is used in the laboratory to test acids and bases? 🔬
- A. Vinegar
- B. Soap
- C. Litmus
- D. Salt
Show Answer 🔽
✅ C. Litmus
3️⃣3️⃣ Which compound is added to toothpaste to prevent tooth decay? 🦷
- A. Sodium chloride
- B. Fluoride
- C. Calcium oxide
- D. Ammonia
Show Answer 🔽
✅ B. Fluoride
3️⃣4️⃣ The pH of lemon juice is approximately: 🍋
- A. 2-3
- B. 4-5
- C. 7
- D. 8-9
Show Answer 🔽
✅ A. 2–3
3️⃣5️⃣ Which one of the following is an alkali? 💧
- A. HCl
- B. NaOH
- C. CH₃COOH
- D. H₂SO₄
Show Answer 🔽
✅ B. NaOH
3️⃣6️⃣ Which acid is produced in the stomach to help in digestion? 🍽️
- A. Nitric acid
- B. Hydrochloric acid
- C. Sulphuric acid
- D. Acetic acid
Show Answer 🔽
✅ B. Hydrochloric acid
3️⃣7️⃣ What is the common name of calcium hydroxide? 🧱
- A. Quick lime
- B. Lime water
- C. Slaked lime
- D. Soda ash
Show Answer 🔽
✅ C. Slaked lime
3️⃣8️⃣ Red litmus turns blue in: 🔵
- A. Distilled water
- B. Acidic solution
- C. Neutral solution
- D. Basic solution
Show Answer 🔽
✅ D. Basic solution
3️⃣9️⃣ Which one is used in the preparation of glass? 🪟
- A. Washing soda
- B. Baking soda
- C. Common salt
- D. Caustic soda
Show Answer 🔽
✅ A. Washing soda
4️⃣0️⃣ Which of the following salts does not contain water of crystallization? 💧
- A. CuSO₄·5H₂O
- B. Na₂CO₃·10H₂O
- C. NaCl
- D. FeSO₄·7H₂O
Show Answer 🔽
✅ C. NaCl
4️⃣1️⃣ The acidic solution shows pH: 🔽
- A. Equal to 7
- B. Greater than 7
- C. Less than 7
- D. Equal to 14
Show Answer 🔽
✅ C. Less than 7
4️⃣2️⃣ Which of the following is basic in nature? 🌿
- A. Lemon juice
- B. Soap solution
- C. Vinegar
- D. Carbonated water
Show Answer 🔽
✅ B. Soap solution
4️⃣3️⃣ Which salt is used in fire extinguishers? 🔥
- A. Sodium hydroxide
- B. Sodium bicarbonate
- C. Sodium chloride
- D. Potassium nitrate
Show Answer 🔽
✅ B. Sodium bicarbonate
4️⃣4️⃣ Water of crystallization in blue vitriol is: 💦
- A. 2
- B. 3
- C. 5
- D. 7
Show Answer 🔽
✅ C. 5
4️⃣5️⃣ The colour of phenolphthalein in basic solution is: 🎨
- A. Colourless
- B. Red
- C. Pink
- D. Blue
Show Answer 🔽
✅ C. Pink
4️⃣6️⃣ Which acid is present in curd? 🥛
- A. Acetic acid
- B. Tartaric acid
- C. Lactic acid
- D. Citric acid
Show Answer 🔽
✅ C. Lactic acid
4️⃣7️⃣ Which one is used as a laboratory acid? 🧪
- A. Acetic acid
- B. Nitric acid
- C. Sulphuric acid
- D. All of these
Show Answer 🔽
✅ D. All of these
4️⃣8️⃣ Strong bases are those which: ⚡
- A. Fully dissociate in water
- B. Slightly dissociate in water
- C. Don’t react with acids
- D. Change red litmus to green
Show Answer 🔽
✅ A. Fully dissociate in water
4️⃣9️⃣ The salt formed by strong acid and strong base is: 🧪
- A. Basic
- B. Neutral
- C. Acidic
- D. Weak
Show Answer 🔽
✅ B. Neutral
5️⃣0️⃣ Which of the following is used to make plaster of Paris? 🏗️
- A. CaCO₃
- B. CaO
- C. CaSO₄·½H₂O
- D. CaCl₂
Show Answer 🔽
✅ C. CaSO₄·½H₂O
51. Which acid is used in soft drinks? 🍺
- A. Acetic acid
- B. Phosphoric acid
- C. Hydrochloric acid
- D. Sulphuric acid
Show Answer 🕺
✅ B. Phosphoric acid
5⃣2⃣ What is the formula of gypsum? 📍
- A. CaSO₄
- B. CaSO₄·½H₂O
- C. CaSO₄·2H₂O
- D. CaCO₃
Show Answer 🕺
✅ C. CaSO₄·2H₂O
5⃣3⃣ What happens to blue vitriol when heated? ✨
- A. It turns red
- B. It changes to white powder
- C. It forms black residue
- D. It turns green
Show Answer 🕺
✅ B. It changes to white powder
5⃣4⃣ What is the common name of Na₂CO₃? 🪤
- A. Baking soda
- B. Washing soda
- C. Caustic soda
- D. Table salt
Show Answer 🕺
✅ B. Washing soda
5⃣5⃣ A solution turns red litmus blue. Its pH is likely to be: 🔢
- A. 1
- B. 5
- C. 7
- D. 10
Show Answer 🕺
✅ D. 10
5⃣6⃣ Which gas is released when an acid reacts with a metal? 😬
- A. CO₂
- B. O₂
- C. H₂
- D. N₂
Show Answer 🕺
✅ C. H₂
5⃣7⃣ What is the pH range of basic substances? 🤔
- A. 1–6
- B. 7
- C. 8–14
- D. 0–4
Show Answer 🕺
✅ C. 8–14
5⃣8⃣ Which one of the following is not an acid-base indicator? 🤸
- A. Litmus
- B. Methyl orange
- C. Phenolphthalein
- D. Sugar solution
Show Answer 🕺
✅ D. Sugar solution
5⃣9⃣ The acid used for preserving food is: 🍽️
- A. Sulphuric acid
- B. Acetic acid
- C. Hydrochloric acid
- D. Citric acid
Show Answer 🕺
✅ B. Acetic acid
6⃣0⃣ When an acid reacts with a base, the process is called: ⚖️
- A. Decomposition
- B. Combination
- C. Neutralization
- D. Precipitation
Show Answer 🕺
✅ C. Neutralization
6⃣1⃣ The base used in making soaps is: 🛋️
- A. Ca(OH)₂
- B. NaOH
- C. KOH
- D. Both B and C
Show Answer 🕺
✅ D. Both B and C
6⃣2⃣ The formula of bleaching powder is: 🧼
- A. CaCl₂
- B. CaOCl₂
- C. Ca(OH)₂
- D. CaCO₃
Show Answer 🕺
✅ B. CaOCl₂
6⃣3⃣ The salt used in cooking is: 🧂
- A. NaOH
- B. NaCl
- C. NaHCO₃
- D. Na₂CO₃
Show Answer 🕺
✅ B. NaCl
6⃣4⃣ Tooth enamel is made up of: 🪥
- A. Calcium phosphate
- B. Calcium carbonate
- C. Calcium oxide
- D. Calcium chloride
Show Answer 🕺
✅ A. Calcium phosphate
6⃣5⃣ The pH of acidic solution lies between: ⚕️
- A. 7–14
- B. 0–7
- C. 0–4
- D. 8–10
Show Answer 🕺
✅ B. 0–7
6⃣6⃣ Which acid is present in tomato? 🍅
- A. Oxalic acid
- B. Citric acid
- C. Acetic acid
- D. Formic acid
Show Answer 🕺
✅ A. Oxalic acid
6⃣7⃣ Which acid is present in ant sting? 🐜
- A. Acetic acid
- B. Formic acid
- C. Citric acid
- D. Hydrochloric acid
Show Answer 🕺
✅ B. Formic acid
6⃣8⃣ Which chemical is used in manufacture of cement? ⚒️
- A. Calcium carbonate
- B. Calcium oxide
- C. Sodium hydroxide
- D. Magnesium carbonate
Show Answer 🕺
✅ B. Calcium oxide
6⃣9⃣ Which of the following is acidic in nature? 🧐
- A. Soap solution
- B. Baking soda
- C. Lemon juice
- D. Caustic soda
Show Answer 🕺
✅ C. Lemon juice
7⃣0⃣ The product of acid + metal carbonate is: 💪
- A. Salt + CO₂
- B. Salt + H₂
- C. Salt + water
- D. Only gas
Show Answer 🕺
✅ A. Salt + CO₂
5️⃣1️⃣ Which acid is used in soft drinks? 🍺
- A. Acetic acid
- B. Phosphoric acid
- C. Hydrochloric acid
- D. Sulphuric acid
Show Answer 🔽
✅ B. Phosphoric acid
5️⃣2️⃣ What is the formula of gypsum? 📍
- A. CaSO₄
- B. CaSO₄·½H₂O
- C. CaSO₄·2H₂O
- D. CaCO₃
Show Answer 🔽
✅ C. CaSO₄·2H₂O
5️⃣3️⃣ What happens to blue vitriol when heated? ✨
- A. It turns red
- B. It changes to white powder
- C. It forms black residue
- D. It turns green
Show Answer 🔽
✅ B. It changes to white powder
5️⃣4️⃣ What is the common name of Na₂CO₃? 🧤
- A. Baking soda
- B. Washing soda
- C. Caustic soda
- D. Table salt
Show Answer 🔽
✅ B. Washing soda
5️⃣5️⃣ A solution turns red litmus blue. Its pH is likely to be: 🔢
- A. 1
- B. 5
- C. 7
- D. 10
Show Answer 🔽
✅ D. 10
5️⃣6️⃣ Which gas is released when an acid reacts with a metal? 😬
- A. CO₂
- B. O₂
- C. H₂
- D. N₂
Show Answer 🔽
✅ C. H₂
5️⃣7️⃣ What is the pH range of basic substances? 🤔
- A. 1–6
- B. 7
- C. 8–14
- D. 0–4
Show Answer 🔽
✅ C. 8–14
5️⃣8️⃣ Which one of the following is not an acid-base indicator? 🧸
- A. Litmus
- B. Methyl orange
- C. Phenolphthalein
- D. Sugar solution
Show Answer 🔽
✅ D. Sugar solution
5️⃣9️⃣ The acid used for preserving food is: 🍽️
- A. Sulphuric acid
- B. Acetic acid
- C. Hydrochloric acid
- D. Citric acid
Show Answer 🔽
✅ B. Acetic acid
6️⃣0️⃣ When an acid reacts with a base, the process is called: ⚖️
- A. Decomposition
- B. Combination
- C. Neutralization
- D. Precipitation
Show Answer 🔽
✅ C. Neutralization
6️⃣1️⃣ The base used in making soaps is: 🧻
- A. Ca(OH)₂
- B. NaOH
- C. KOH
- D. Both B and C
Show Answer 🔽
✅ D. Both B and C
6️⃣2️⃣ The formula of bleaching powder is: 🧼
- A. CaCl₂
- B. CaOCl₂
- C. Ca(OH)₂
- D. CaCO₃
Show Answer 🔽
✅ B. CaOCl₂
6️⃣3️⃣ The salt used in cooking is: 🧂
- A. NaOH
- B. NaCl
- C. NaHCO₃
- D. Na₂CO₃
Show Answer 🔽
✅ B. NaCl
6️⃣4️⃣ Tooth enamel is made up of: 🦷
- A. Calcium phosphate
- B. Calcium carbonate
- C. Calcium oxide
- D. Calcium chloride
Show Answer 🔽
✅ A. Calcium phosphate
6️⃣5️⃣ The pH of acidic solution lies between: ⚗️
- A. 7–14
- B. 0–7
- C. 0–4
- D. 8–10
Show Answer 🔽
✅ B. 0–7
6️⃣6️⃣ Which acid is present in tomato? 🍅
- A. Oxalic acid
- B. Citric acid
- C. Acetic acid
- D. Formic acid
Show Answer 🔽
✅ A. Oxalic acid
6️⃣7️⃣ Which acid is present in ant sting? 🐜
- A. Acetic acid
- B. Formic acid
- C. Citric acid
- D. Hydrochloric acid
Show Answer 🔽
✅ B. Formic acid
6️⃣8️⃣ Which chemical is used in manufacture of cement? ⚒️
- A. Calcium carbonate
- B. Calcium oxide
- C. Sodium hydroxide
- D. Magnesium carbonate
Show Answer 🔽
✅ B. Calcium oxide
6️⃣9️⃣ Which of the following is acidic in nature? 🧐
- A. Soap solution
- B. Baking soda
- C. Lemon juice
- D. Caustic soda
Show Answer 🔽
✅ C. Lemon juice
7️⃣0️⃣ The product of acid + metal carbonate is: 💪
- A. Salt + CO₂
- B. Salt + H₂
- C. Salt + water
- D. Only gas
Show Answer 🔽
✅ A. Salt + CO₂
7️⃣1️⃣ Which acid is used in car batteries? 🔋
- A. Hydrochloric acid
- B. Nitric acid
- C. Sulphuric acid
- D. Acetic acid
Show Answer 🔽
✅ C. Sulphuric acid
7️⃣2️⃣ Which base is used in oven cleaners? 🧽
- A. KOH
- B. NaOH
- C. NH₄OH
- D. Ca(OH)₂
Show Answer 🔽
✅ B. NaOH
7️⃣3️⃣ Which gas turns limewater milky? 🥛
- A. Oxygen
- B. Hydrogen
- C. Carbon dioxide
- D. Nitrogen
Show Answer 🔽
✅ C. Carbon dioxide
7️⃣4️⃣ Which of the following is a weak acid? 🧪
- A. H₂SO₄
- B. HNO₃
- C. HCl
- D. CH₃COOH
Show Answer 🔽
✅ D. CH₃COOH
7️⃣5️⃣ Which acid is present in curd? 🥛
- A. Lactic acid
- B. Citric acid
- C. Acetic acid
- D. Formic acid
Show Answer 🔽
✅ A. Lactic acid
7️⃣6️⃣ What is the nature of metal oxides? ⚙️
- A. Acidic
- B. Basic
- C. Neutral
- D. Amphoteric
Show Answer 🔽
✅ B. Basic
7️⃣7️⃣ The formula of baking soda is: 🍪
- A. Na₂CO₃
- B. NaHCO₃
- C. NaCl
- D. NaOH
Show Answer 🔽
✅ B. NaHCO₃
7️⃣8️⃣ Which salt is used in cold packs? 🧊
- A. Calcium chloride
- B. Ammonium nitrate
- C. Sodium bicarbonate
- D. Magnesium sulphate
Show Answer 🔽
✅ B. Ammonium nitrate
7️⃣9️⃣ Which is the most acidic substance below? 🔥
- A. Soap solution
- B. Lemon juice
- C. Milk
- D. Baking soda
Show Answer 🔽
✅ B. Lemon juice
8️⃣0️⃣ Which of these neutralizes an acid? 🧪
- A. Alcohol
- B. Base
- C. Salt
- D. Water
Show Answer 🔽
✅ B. Base
8️⃣1️⃣ Which ion is responsible for acidic properties of acids? 💧
- A. OH⁻
- B. H⁺
- C. Cl⁻
- D. Na⁺
Show Answer 🔽
✅ B. H⁺
8️⃣2️⃣ Which ion is responsible for basic properties of bases? 🧪
- A. H⁺
- B. Cl⁻
- C. OH⁻
- D. CO₃²⁻
Show Answer 🔽
✅ C. OH⁻
8️⃣3️⃣ Which compound is used to treat acidity in stomach? 🩺
- A. NaCl
- B. NaHCO₃
- C. HCl
- D. Na₂CO₃
Show Answer 🔽
✅ B. NaHCO₃
8️⃣4️⃣ What is the pH of pure water at 25°C? 💦
- A. 5
- B. 6
- C. 7
- D. 8
Show Answer 🔽
✅ C. 7
8️⃣5️⃣ What happens when acid reacts with metal carbonate? ⚗️
- A. Only salt is formed
- B. Only gas is evolved
- C. Salt, water and CO₂ are formed
- D. Salt and hydrogen are formed
Show Answer 🔽
✅ C. Salt, water and CO₂ are formed
8️⃣6️⃣ Which of the following is a neutral substance? ⚖️
- A. Vinegar
- B. Water
- C. Soap solution
- D. Lemon juice
Show Answer 🔽
✅ B. Water
8️⃣7️⃣ Which of these substances is basic in nature? 🧴
- A. Curd
- B. Lemon juice
- C. Soap
- D. Vinegar
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✅ C. Soap
8️⃣8️⃣ The substance used in antacids is: 💊
- A. NaOH
- B. Ca(OH)₂
- C. NaHCO₃
- D. HCl
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✅ C. NaHCO₃
8️⃣9️⃣ The acid used in pickling is: 🥒
- A. Sulphuric acid
- B. Hydrochloric acid
- C. Acetic acid
- D. Nitric acid
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✅ C. Acetic acid
9️⃣0️⃣ Which compound is known as slaked lime? 🏗️
- A. CaCO₃
- B. Ca(OH)₂
- C. CaCl₂
- D. CaSO₄
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✅ B. Ca(OH)₂
9️⃣1️⃣ What happens when a base is dissolved in water? 💧
- A. Produces OH⁻ ions
- B. Produces H⁺ ions
- C. Produces salt
- D. Becomes neutral
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✅ A. Produces OH⁻ ions
9️⃣2️⃣ Which among the following is an acid? 🧫
- A. KOH
- B. HCl
- C. NaOH
- D. Ca(OH)₂
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✅ B. HCl
9️⃣3️⃣ What is the chemical name of baking soda? 🍞
- A. Sodium chloride
- B. Sodium carbonate
- C. Sodium bicarbonate
- D. Sodium hydroxide
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✅ C. Sodium bicarbonate
9️⃣4️⃣ What type of reaction is Neutralization? ⚗️
- A. Physical change
- B. Chemical change
- C. Both A and B
- D. None
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✅ B. Chemical change
9️⃣5️⃣ Which of the following changes blue litmus to red? 🧪
- A. Soap
- B. NaOH
- C. Vinegar
- D. Water
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✅ C. Vinegar
9️⃣6️⃣ Which one is used in toothpaste to prevent decay? 😁
- A. Fluoride
- B. Calcium oxide
- C. Sodium chloride
- D. Magnesium sulphate
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✅ A. Fluoride
9️⃣7️⃣ Which of the following is a household base? 🏡
- A. Vinegar
- B. Lemon juice
- C. Baking soda
- D. Citric acid
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✅ C. Baking soda
9️⃣8️⃣ Which gas is evolved when acid reacts with metal? ⛽
- A. O₂
- B. H₂
- C. CO₂
- D. N₂
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✅ B. H₂
9️⃣9️⃣ What will be the pH of a strong base? 📈
- A. Around 3
- B. Around 7
- C. Around 9
- D. Around 13
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✅ D. Around 13
🔟0️⃣0️⃣ What is formed when an acid reacts with a base? ⚗️
- A. Acid
- B. Base
- C. Salt and water
- D. Gas only
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✅ C. Salt and water