⚗️ Acids, Bases and Salts – Class 10 Science MCQs

Part 2: Neutralization, Uses of Acids & Bases, pH in Daily Life (Q26–Q50)

Q26. Neutralization reaction is a reaction between:

A. Acid and salt
B. Base and water
C. Acid and base
D. Salt and water

✅ Correct Answer: C. Acid and base

Explanation: Acid + Base → Salt + Water.

Q27. The products of neutralization are:

A. Salt only
B. Salt and water
C. Acid and base
D. Gas and water

✅ Correct Answer: B. Salt and water

Q28. Which reaction represents neutralization?

A. HCl + NaOH → NaCl + H₂
B. HCl + NaOH → NaCl + H₂O
C. Na₂CO₃ → Na₂O + CO₂
D. Zn + H₂SO₄ → ZnSO₄ + H₂

✅ Correct Answer: B. HCl + NaOH → NaCl + H₂O

Q29. Which of the following is NOT a use of hydrochloric acid?

A. Cleaning metal surfaces
B. Manufacture of fertilizers
C. Used in batteries
D. Production of medicines

✅ Correct Answer: C. Used in batteries

Explanation: Batteries contain sulphuric acid, not HCl.

Q30. Sulphuric acid is called:

A. King of bases
B. King of acids
C. Weak acid
D. Organic acid

✅ Correct Answer: B. King of acids

Q31. Which acid is present in our stomach?

A. H₂SO₄
B. HCl
C. CH₃COOH
D. HNO₃

✅ Correct Answer: B. HCl

Q32. Which base is used in antacids?

A. NaOH
B. Mg(OH)₂
C. KOH
D. CaO

✅ Correct Answer: B. Mg(OH)₂

Explanation: Antacids neutralize excess HCl in stomach.

Q33. Tooth decay starts when pH of mouth is:

A. 7.0
B. 6.8
C. Less than 5.5
D. Greater than 8

✅ Correct Answer: C. Less than 5.5

Q34. Which base is used in manufacturing soap?

A. KOH
B. NaOH
C. Both A and B
D. Mg(OH)₂

✅ Correct Answer: C. Both A and B

Q35. Which acid is present in curd?

A. Acetic acid
B. Lactic acid
C. Tartaric acid
D. Oxalic acid

✅ Correct Answer: B. Lactic acid

Q36. Which acid is used in soft drinks?

A. Carbonic acid
B. Oxalic acid
C. Acetic acid
D. Lactic acid

✅ Correct Answer: A. Carbonic acid (H₂CO₃)

Q37. Which base is used in making bleaching powder?

A. NaOH
B. KOH
C. Ca(OH)₂
D. Mg(OH)₂

✅ Correct Answer: C. Ca(OH)₂

Explanation: Ca(OH)₂ + Cl₂ → CaOCl₂ (bleaching powder).

Q38. Which acid is present in ant sting?

A. Formic acid
B. Acetic acid
C. Citric acid
D. Lactic acid

✅ Correct Answer: A. Formic acid

Q39. Which of these can be used to neutralize an ant sting?

A. Vinegar
B. Baking soda
C. Lemon juice
D. Hydrochloric acid

✅ Correct Answer: B. Baking soda

Explanation: Ant sting → acidic → treated with mild base.

Q40. Which base is known as caustic potash?

A. NaOH
B. KOH
C. Ca(OH)₂
D. Mg(OH)₂

✅ Correct Answer: B. KOH

Q41. Which acid is used in car batteries?

A. HNO₃
B. H₂SO₄
C. HCl
D. H₃PO₄

✅ Correct Answer: B. H₂SO₄ (Sulphuric acid)

Q42. Which of the following acids is used in fertilizers?

A. HCl
B. HNO₃
C. H₂SO₄
D. CH₃COOH

✅ Correct Answer: B. HNO₃ (Nitric acid)

Q43. The human stomach secretes HCl because:

A. Helps in digestion of proteins
B. Kills harmful bacteria
C. Creates acidic medium for enzymes
D. All of these

✅ Correct Answer: D. All of these

Q44. The pH of rainwater in unpolluted areas is around:

A. 7
B. 5.6
C. 6.5
D. 4.5

✅ Correct Answer: B. 5.6

Explanation: Due to dissolved CO₂ forming weak carbonic acid.

Q45. Acid rain is caused by:

A. HCl and HNO₃
B. SO₂ and NO₂ dissolving in rainwater
C. CO₂ only
D. Ozone

✅ Correct Answer: B. SO₂ and NO₂ dissolving in rainwater

Q46. Which of these is used in toothpaste to prevent tooth decay?

A. Baking soda
B. Fluoride salts
C. NaCl
D. KOH

✅ Correct Answer: B. Fluoride salts

Q47. The pH of human blood is around:

A. 5.5
B. 6.0
C. 7.4
D. 8.5

✅ Correct Answer: C. 7.4

Q48. Which base is used as an antacid?

A. NaOH
B. Mg(OH)₂
C. Ca(OH)₂
D. KOH

✅ Correct Answer: B. Mg(OH)₂

Q49. Farmers add quick lime (CaO) to acidic soil to:

A. Increase acidity
B. Neutralize excess acidity
C. Reduce fertility
D. Increase water content

✅ Correct Answer: B. Neutralize excess acidity

Q50. Which of the following statements is TRUE?

A. Bases have pH less than 7
B. Strong acids have pH near 14
C. Neutral solutions have pH equal to 7
D. Weak acids always have pH greater than 7

✅ Correct Answer: C. Neutral solutions have pH equal to 7

Acids Bases and Salts Class 10, CBSE Class 10 Science MCQs, NCERT Class 10 science questions, Class 10 Science exam practice, Online learning Science Class 10, acids bases and salts class 10 mcqs with answers, cbse class 10 science acids bases salts multiple choice questions, ncert class 10 acids bases and salts quiz online, important mcqs for cbse class 10 science acids bases and salts, acids bases and salts class 10 mcqs for online learning