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which comparison is correct

Hsmall2S is a stronger acid than HCl
NHsmall3 is a stronger acid than HF
PHsmall3 is a stronger acid than NHsmall3
HF is a stronger acid than HCl

1 answer

To evaluate the strength of the acids in the comparisons you've presented:

  1. H₂S is a stronger acid than HCl: This is incorrect. HCl is a strong acid that completely dissociates in solution, while H₂S is a weak acid.

  2. NH₃ is a stronger acid than HF: This is incorrect. NH₃ (ammonia) is not an acid; it's a weak base. HF (hydrofluoric acid), while a weak acid compared to strong acids, is stronger than NH₃.

  3. PH₃ is a stronger acid than NH₃: This is generally true. PH₃ (phosphine) can behave as a weak acid in some contexts and is often considered to be a stronger acid than NH₃.

  4. HF is a stronger acid than HCl: This is incorrect. HCl is a stronger acid than HF.

Based on the evaluations, the correct comparison is: PH₃ is a stronger acid than NH₃.