Here is ✅ Set 2 of Chemistry Quiz for Class X
Topic: Acids, Bases and Salts
Each question includes 4 options, correct answer, and explanation.
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✅ Set 2: Acids, Bases and Salts
1. Which acid is present in lemon?
a) Acetic acid
b) Citric acid
c) Formic acid
d) Tartaric acid
✔️Answer: b) Citric acid
Explanation: Lemons are rich in citric acid, giving them a sour taste.
2. The pH of a neutral solution is:
a) 0
b) 7
c) 14
d) 1
✔️Answer: b) 7
Explanation: A solution with pH 7 is neutral, like pure water.
3. Which of the following is a basic oxide?
a) CO₂
b) SO₂
c) CaO
d) NO₂
✔️Answer: c) CaO
Explanation: Calcium oxide is a metal oxide and is basic in nature.
4. Which acid is used in car batteries?
a) Hydrochloric acid
b) Nitric acid
c) Sulphuric acid
d) Acetic acid
✔️Answer: c) Sulphuric acid
Explanation: Lead-acid batteries use dilute H₂SO₄ as electrolyte.
5. Which of the following gives a soapy touch?
a) Acids
b) Bases
c) Salts
d) Alcohol
✔️Answer: b) Bases
Explanation: Bases like NaOH feel slippery or soapy to touch.
6. Litmus turns red in which solution?
a) Soap solution
b) Baking soda
c) Vinegar
d) Ammonia
✔️Answer: c) Vinegar
Explanation: Vinegar is acidic and turns blue litmus red.
7. Which of these is a weak acid?
a) Hydrochloric acid
b) Sulphuric acid
c) Nitric acid
d) Acetic acid
✔️Answer: d) Acetic acid
Explanation: Acetic acid (CH₃COOH) is a weak acid as it does not completely dissociate in water.
8. Which of the following is used to treat indigestion?
a) Hydrochloric acid
b) Sodium bicarbonate
c) Sulphuric acid
d) Nitric acid
✔️Answer: b) Sodium bicarbonate
Explanation: It neutralizes excess stomach acid.
9. Which salt is formed from HCl and NaOH?
a) NaCl
b) Na₂SO₄
c) KCl
d) CaCl₂
✔️Answer: a) NaCl
Explanation: HCl + NaOH → NaCl + H₂O (neutralization reaction).
10. What is the pH range of acidic substances?
a) 0–6.9
b) 7–14
c) Only 7
d) 9–14
✔️Answer: a) 0–6.9
Explanation: pH less than 7 indicates acidic nature.
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