Top Chemistry Questions Set 6 – MCQs with Answers for Exams & Practice

1. Acids in Nature & Daily Life

  1. Which acid is found in lemons?
    a. Phosphoric acid
    b. Carbonic acid
    c. Citric acid
    d. Malic acid
    Ans: c
  2. Which acid gives spinach its acidic character?
    a. Lactic acid
    b. Oxalic acid
    c. Carbonic acid
    d. Formic acid
    Ans: b
  3. Which acid causes milk to turn sour?
    a. Acetic acid
    b. Citric acid
    c. Ascorbic acid
    d. Lactic acid
    Ans: d
  4. Which acid is used to remove rust and iron stains from clothes?
    a. Citric acid
    b. Dilute hydrochloric acid
    c. Oxalic acid
    d. Acetic acid
    Ans: c
  5. Tartaric acid is not present in which of the following?
    a. Tamarind
    b. Grapes
    c. Unripe mangoes
    d. Spinach
    Ans: d
  6. Bee stings contain:
    a. An acidic liquid
    b. A salt solution
    c. An alkaline liquid
    d. A corrosive agent
    Ans: a
  7. Which acid is responsible for the sour taste in Coca-Cola?
    a. Acetic acid
    b. Phosphoric acid
    c. Hydrochloric acid
    d. Formic acid
    Ans: b
  8. Which acid is also known as “Muriatic acid”?
    a. Hydrochloric acid
    b. Sulphuric acid
    c. Carbonic acid
    d. Nitric acid
    Ans: a
  9. Which acid is present in tomatoes?
    a. Oxalic acid
    b. Citric acid
    c. Acetic acid
    d. Malic acid
    Ans: a
  10. Which acid is found in apples?
    a. Citric acid
    b. Acetic acid
    c. Malic acid
    d. None of the above
    Ans: c

2. Common Substances & Chemical Names

  1. What is the common name of sodium carbonate?
    a. Limestone
    b. Lime
    c. Marble
    d. Washing soda
    Ans: d
  2. What is the common name of CaOCl₂?
    a. Baking soda
    b. Bleaching powder
    c. Baking powder
    d. Washing soda
    Ans: b
  3. Sodium bicarbonate is also known as:
    a. Baking soda
    b. Washing powder
    c. Plaster
    d. Fly ash
    Ans: a
  4. What is brine solution?
    a. Excess salt in water
    b. Silver in water
    c. Excess ethanol in water
    d. Excess starch in water
    Ans: a
  5. Which substance turns black when concentrated sulphuric acid is added?
    a. Vinegar
    b. Sugar
    c. Salt
    d. Alcohol
    Ans: b

3. Reactions & Uses

  1. Which acid is used to dissolve noble metals like gold and platinum?
    a. Nitric acid
    b. Hydrochloric acid
    c. Sulphuric acid
    d. Aqua regia
    Ans: d
  2. Which acid does not release CO₂ from sodium bicarbonate?
    a. Sulphuric acid
    b. Formic acid
    c. Carbonic acid
    d. Acetic acid
    Ans: a
  3. Which acid is used in making aspirin?
    a. Acetic acid
    b. Salicylic acid
    c. Oxalic acid
    d. Succinic acid
    Ans: b
  4. Which ester is used medicinally (e.g., in pain balms)?
    a. Ethyl acetate
    b. Methyl acetate
    c. Methyl salicylate
    d. Ethyl benzoate
    Ans: c

4. Indicators, pH & Acidity

  1. The pH of lemon juice is expected to be:
    a. More than 7
    b. Less than 7
    c. Equal to 7
    d. Cannot be predicted
    Ans: b
  2. The pH range of human blood is:
    a. 8.25 – 8.35
    b. 7.35 – 7.45
    c. 6.45 – 6.55
    d. 4.0 – 4.5
    Ans: b
  3. The color of nitric acid is due to the presence of:
    a. Carbon dioxide
    b. Sulphur dioxide
    c. Colored impurities
    d. Nitrogen dioxide
    Ans: d

5. Matching & Sources

  1. Match the substance with its nature:
  • A. Acidic – 2. Carbonated drink
  • B. Basic – 3. Soap
  • C. Neutral – 1. Distilled water
    Ans: b
  1. Match the acid with its natural source:
  • A. Formic acid – 3. Ants
  • B. Citric acid – 1. Lemon
  • C. Tartaric acid – 2. Tamarind
    Ans: b

6. Elements, Oxides, and Miscellaneous

  1. Which of the following is a pure element?
    a. Glass
    b. Cement
    c. Sodium
    d. Steel
    Ans: c
  2. Which acid does NOT react with gold?
    a. Nitric acid
    b. Copper
    c. Zinc
    d. Iron
    Ans: a
  3. Sodium carbonate is a basic salt because it is derived from:
    a. Weak acid and weak base
    b. Strong acid and strong base
    c. Weak acid and strong base
    d. Strong acid and weak base
    Ans: c
  4. Kidney stones are primarily made of:
    a. Calcium oxalate
    b. Sodium chloride
    c. Magnesium nitrate
    d. Calcium bicarbonate
    Ans: a
  5. Which of the following is NOT a base?
    a. Ba(OH)₂
    b. Sr(OH)₂
    c. B(OH)₃
    d. Ca(OH)₂
    Ans: c
  6. Who invented soda water?
    a. Tivadar Puskás
    b. Joseph Priestley
    c. Petrache Poenaru
    d. James L. Plimpton
    Ans: b

7. Bases & Indicators

  1. Which base is used as an antacid?
    a. Calcium hydroxide
    b. Barium hydroxide
    c. Magnesium hydroxide
    d. Silver hydroxide
    Ans: c
  2. Which of the following are natural indicators?
    a. Phenolphthalein
    b. Litmus
    c. Methyl orange
    d. All of the above
    Ans: d
  3. Litmus is obtained from:
    a. Bacteria
    b. Fungus
    c. Alga
    d. Lichen
    Ans: d
  4. Aluminium oxide is:
    a. Basic oxide
    b. Neutral oxide
    c. Amphoteric oxide
    d. Acidic oxide
    Ans: c

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