SSC CGL MCQ Practice 2026

Chemistry - Acids, Bases & Salts Questions for SSC CGL (with Answers)

15 Chemistry - Acids, Bases & Salts MCQs from the General Awareness section, with answers and short explanations.

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Q1. Which acid is formed when milk turns into curd?

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Answer: C. Lactic acid

Bacteria convert milk sugar into lactic acid, which sets curd.

Chemistry - Acids, Bases & Salts · easy · Beginner Practice Set 1

Q2. What is the chemical formula of baking soda?

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Answer: C. NaHCO3

Baking soda is sodium hydrogen carbonate, NaHCO3.

Chemistry - Acids, Bases & Salts · easy · Beginner Practice Set 1

Q3. Which acid is present in vinegar?

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Answer: A. Acetic acid

Vinegar is a dilute solution of acetic (ethanoic) acid.

Chemistry - Acids, Bases & Salts · easy · Beginner Practice Set 6

Q4. The pH of a neutral solution at room temperature is:

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Answer: A. 7

A neutral solution such as pure water has pH 7.

Chemistry - Acids, Bases & Salts · easy · Beginner Practice Set 7

Q5. Which acid is produced in our stomach to help digestion?

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Answer: A. Hydrochloric acid

The stomach produces hydrochloric acid, which aids digestion.

Chemistry - Acids, Bases & Salts · easy · Beginner Practice Set 9

Q6. The sting of an ant or a nettle leaf injects which acid?

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Answer: B. Methanoic (formic) acid

Ant and nettle stings contain methanoic acid, also called formic acid.

Chemistry - Acids, Bases & Salts · medium · Intermediate Practice Set 1

Q7. Milk of magnesia, used as an antacid, is chemically:

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Answer: C. Magnesium hydroxide

Milk of magnesia is Mg(OH)2, a mild base that neutralises excess stomach acid.

Chemistry - Acids, Bases & Salts · medium · Intermediate Practice Set 2

Q8. The chlor-alkali process involves the electrolysis of:

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Answer: D. Aqueous sodium chloride (brine)

Electrolysis of brine gives NaOH, Cl2 and H2; hence the name chlor-alkali.

Chemistry - Acids, Bases & Salts · medium · Intermediate Practice Set 3

Q9. Bleaching powder is prepared by passing chlorine gas over:

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Answer: A. Dry slaked lime

Chlorine reacts with dry slaked lime, Ca(OH)2, to give bleaching powder (CaOCl2).

Chemistry - Acids, Bases & Salts · medium · Intermediate Practice Set 3

Q10. Which acid is present in tomatoes?

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Answer: C. Oxalic acid

Tomatoes contain oxalic acid.

Chemistry - Acids, Bases & Salts · medium · Intermediate Practice Set 6

Q11. How many molecules of water of crystallisation are present in one formula unit of blue copper sulphate crystals?

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Answer: C. 5

Blue vitriol is CuSO4·5H2O, containing five water molecules.

Chemistry - Acids, Bases & Salts · medium · Intermediate Practice Set 6

Q12. What is the chemical formula of washing soda?

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Answer: B. Na2CO3·10H2O

Washing soda is sodium carbonate decahydrate, Na2CO3·10H2O.

Chemistry - Acids, Bases & Salts · medium · Intermediate Practice Set 7

Q13. Plaster of Paris is obtained by heating gypsum at about 373 K. Its chemical formula is:

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Answer: A. CaSO4·½H2O

Heating gypsum (CaSO4·2H2O) at 373 K gives plaster of Paris, CaSO4·½H2O.

Chemistry - Acids, Bases & Salts · hard · Advanced Practice Set 4

Q14. An aqueous solution of sodium chloride has a pH of about:

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Answer: C. 7, because it is a salt of a strong acid and a strong base

NaCl comes from HCl (strong acid) and NaOH (strong base), so its solution is neutral.

Chemistry - Acids, Bases & Salts · hard · Advanced Practice Set 5

Q15. Tooth enamel starts to corrode when the pH in the mouth falls below about:

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Answer: D. 5.5

Enamel (calcium hydroxyapatite) begins to corrode when mouth pH drops below 5.5.

Chemistry - Acids, Bases & Salts · hard · Advanced Practice Set 6

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