CSS - PMS - CCE - PCS - General Science Practice

CSS - PMS - CCE - PCS - General Science MCQs

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CSS - PMS - CCE - PCS - General Science

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CSS - PMS - CCE - PCS - General Science Acid/Base
The commonly used pH scale for dilute aqueous solutions usually ranges from:
A. 0 to 7
B. 1 to 10
C. 0 to 14
D. 7 to 21
Read Theory
Correct Answer: C
A: Incorrect because 0 to 7 covers only acidic to neutral values. B: Incorrect because 1 to 10 omits many common acidic and basic values. C: Correct because the conventional school-level pH scale for dilute aqueous solutions is 0 to 14, although extreme solutions can fall outside it. D: Incorrect because 7 to 21 is not the standard classroom pH range.
CSS - PMS - CCE - PCS - General Science Acid/Base
What is the chemical name of HCl?
A. Hydrochloric acid
B. Sulfuric acid
C. Nitric acid
D. Carbonic acid
Read Theory
Correct Answer: A
A: Correct because HCl in aqueous solution is hydrochloric acid. B: Incorrect because sulfuric acid is H₂SO₄. C: Incorrect because nitric acid is HNO₃. D: Incorrect because carbonic acid is H₂CO₃.
CSS - PMS - CCE - PCS - General Science Acid/Base
What is the chemical formula of sulfuric acid?
A. HCl
B. H₂SO₄
C. HNO₃
D. CH₃COOH
Read Theory
Correct Answer: B
A: Incorrect because HCl is hydrochloric acid. B: Correct because sulfuric acid has the formula H₂SO₄. C: Incorrect because HNO₃ is nitric acid. D: Incorrect because CH₃COOH is acetic acid.
CSS - PMS - CCE - PCS - General Science Acid/Base
What is the chemical formula of nitric acid?
A. HNO₃
B. H₂SO₄
C. H₃PO₄
D. H₂CO₃
Read Theory
Correct Answer: A
A: Correct because nitric acid has the formula HNO₃. B: Incorrect because H₂SO₄ is sulfuric acid. C: Incorrect because H₃PO₄ is phosphoric acid. D: Incorrect because H₂CO₃ is carbonic acid.
CSS - PMS - CCE - PCS - General Science Acid/Base
Acetic acid has the formula:
A. HCOOH
B. CH₃COOH
C. H₂SO₄
D. NaHCO₃
Read Theory
Correct Answer: B
A: Incorrect because HCOOH is formic acid. B: Correct because acetic or ethanoic acid is CH₃COOH. C: Incorrect because H₂SO₄ is sulfuric acid. D: Incorrect because NaHCO₃ is sodium hydrogen carbonate.
CSS - PMS - CCE - PCS - General Science Acid/Base
Carbonic acid is represented by:
A. H₂CO₃
B. H₂SO₃
C. HClO
D. H₃BO₃
Read Theory
Correct Answer: A
A: Correct because carbonic acid has the formula H₂CO₃. B: Incorrect because H₂SO₃ is sulfurous acid. C: Incorrect because HClO is hypochlorous acid. D: Incorrect because H₃BO₃ is boric acid.
CSS - PMS - CCE - PCS - General Science Acid/Base
Sodium hydroxide is commonly called:
A. Caustic soda
B. Caustic potash
C. Slaked lime
D. Baking soda
Read Theory
Correct Answer: A
A: Correct because sodium hydroxide, NaOH, is commonly known as caustic soda. B: Incorrect because caustic potash is KOH. C: Incorrect because slaked lime is Ca(OH)₂. D: Incorrect because baking soda is NaHCO₃.
CSS - PMS - CCE - PCS - General Science Acid/Base
Potassium hydroxide is commonly called:
A. Caustic soda
B. Caustic potash
C. Quicklime
D. Washing soda
Read Theory
Correct Answer: B
A: Incorrect because caustic soda is NaOH. B: Correct because potassium hydroxide, KOH, is commonly known as caustic potash. C: Incorrect because quicklime is CaO. D: Incorrect because washing soda is Na₂CO₃·10H₂O.
CSS - PMS - CCE - PCS - General Science Acid/Base
Slaked lime has the formula:
A. CaO
B. Ca(OH)₂
C. CaCO₃
D. CaCl₂
Read Theory
Correct Answer: B
A: Incorrect because CaO is quicklime. B: Correct because slaked lime is calcium hydroxide, Ca(OH)₂. C: Incorrect because CaCO₃ is calcium carbonate. D: Incorrect because CaCl₂ is calcium chloride.
CSS - PMS - CCE - PCS - General Science Acid/Base
Milk of magnesia mainly contains:
A. Mg(OH)₂
B. MgCl₂
C. NaOH
D. CaCO₃
Read Theory
Correct Answer: A
A: Correct because milk of magnesia is a suspension of magnesium hydroxide, Mg(OH)₂. B: Incorrect because MgCl₂ is magnesium chloride. C: Incorrect because NaOH is sodium hydroxide and is too caustic for this use. D: Incorrect because CaCO₃ is calcium carbonate.
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