S

Shyam Dubey • 3.70K Points
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Q. Which of the following correctly ranks species by increasing acidity in aqueous solution?

  • (A) NH3 < H2O < HF
  • (B) HF < H2O < NH3
  • (C) H2O < HF < NH3
  • (D) NH3 < HF < H2O
  • Correct Answer - Option(A)
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  • Filed under category Chemistry
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Explanation by: Shyam Dubey
In water, ammonia (NH3) is the weakest acid among these (pKa of NH4+ is about 9.25, so NH3 is very weak acid), water is intermediate (pKa ~15.7), and HF is stronger (pKa ~3.2) — so acidity increases NH3 < H2O < HF. The other options list incorrect orderings.

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