Which of the following is an example of dibasic acid?

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MP Excise Constable Official paper (Held On: 20 Feb 2023 Shift 3)
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  1. Phosphoric acid 
  2. Boric acid 
  3. Arsenic acid
  4. Phosphorous acid

Answer (Detailed Solution Below)

Option 4 : Phosphorous acid
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Detailed Solution

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The correct answer is Phosphorous acid.

Key Points

  • Phosphorous acid (H3PO3) is a dibasic acid.
  • It has two acidic hydrogen atoms that can dissociate in an aqueous solution.
  • This characteristic allows it to donate two protons, making it a dibasic acid.
  • Phosphorous acid is often used in the preparation of phosphite salts, which are important in agriculture and industry.

Additional Information

  • Phosphoric Acid (H3PO4)
    • Phosphoric acid is a tribasic acid with three hydrogen atoms available for donation.
    • It is widely used in the food industry, especially in cola beverages.
    • In agriculture, it is used as a fertilizer component.
  • Boric Acid (H3BO3)
    • Boric acid is a weak monobasic acid.
    • It is commonly used as an antiseptic, insecticide, and flame retardant.
  • Arsenic Acid (H3AsO4)
    • Arsenic acid is a tribasic acid similar to phosphoric acid.
    • It is used in the manufacture of arsenate wood preservatives.
  • Acidity
    • Acidity refers to the ability of a substance to donate hydrogen ions (H+) in an aqueous solution.
    • Acids are classified based on the number of hydrogen ions they can donate (monobasic, dibasic, tribasic).
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