Question:

Which one of the following is correct?

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Boric Acid as Antiseptic.
  • Mild antiseptic in pharmaceutical applications.
  • Works due to weak acidity and ability to inhibit microbial growth.
Updated On: May 20, 2025
  • Thallium is more electropositive than aluminium
  • Boron has high electrical conductivity
  • An aqueous solution of ortho boric acid is generally used as a mild antiseptic
  • Boron-11 ${^{11}B}$) isotope has high ability to absorb neutrons
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The Correct Option is C

Approach Solution - 1

Option (3) is correct. Ortho boric acid (\( \mathrm{H_3BO_3} \)) is a weak monobasic acid and is widely used as a mild antiseptic for eyes and skin due to its antibacterial properties.

  • Thallium is less electropositive than aluminium, so (1) is incorrect.
  • Boron is a metalloid and a poor conductor of electricity, so (2) is incorrect.
  • Boron-11 isotope has neutron absorbing ability but not the highest — \( ^{10}\mathrm{B} \) is preferred in nuclear applications. Hence, (4) is incorrect.
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Approach Solution -2

Step 1: Understanding ortho boric acid
Ortho boric acid, also known simply as boric acid (H₃BO₃), is a weak acid commonly used in various applications due to its antiseptic, antifungal, and antibacterial properties.

Step 2: Properties of boric acid solution
When dissolved in water, boric acid acts as a mild antiseptic solution. It helps inhibit the growth of bacteria and fungi without causing irritation or strong chemical reactions.

Step 3: Applications as an antiseptic
Due to its mild nature, aqueous solutions of ortho boric acid are widely used in medical and personal care products, such as eye washes, skin lotions, and wound dressings, to prevent infection and promote healing.

Step 4: Why other options are less suitable
Other chemical substances may have stronger antiseptic properties but can be more irritating or toxic. Boric acid’s balance of effectiveness and mildness makes it especially valuable.

Step 5: Conclusion
Hence, the correct statement is that an aqueous solution of ortho boric acid is generally used as a mild antiseptic.
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