In which one of the given reactions a salt is reacting with a base?

In which one of the given reactions a salt is reacting with a base?

Q. In which one of the given reactions a salt is reacting with a base?

  1. NaOH+HCl→NaCl+H₂O
  2. Cu(OH)₂+H₂SO₄→CuSO₄+2H₂O
  3. KOH+HCl→KCl+H₂O
  4. 6NH₄OH+Al(SO₄)₃→2Al(OH)₃+3(NH₄)₂SO₄

Answer: 6NH₄OH+Al(SO₄)₃→2Al(OH)₃+3(NH₄)₂SO₄

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