Salt of weak acid & weak base is
Correct answer: C. NH₄NO₂
- A. NH₄NO₃
- B. NaCN
- C. NH₄NO₂
- D. K₂CO₃
Explanation
The correct answer is NH₄NO₂. This salt is formed from the weak acid HNO₂ and the weak base NH₃, which means it fulfills the criteria of being derived from both a weak acid and a weak base. NH₄NO₃ is incorrect because it is derived from a weak base (NH₃) and a strong acid (HNO₃). NaCN is incorrect because it is derived from a strong base (NaOH) and a weak acid (HCN). K₂CO₃ is incorrect because it is derived from a strong base (KOH) and a weak acid (H₂CO₃). To identify the nature of a salt, consider the strengths of the acid and base that form it.
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About Acids, Bases and Salts
Acid and base behaviour is explained through the Bronsted-Lowry transfer of protons and the Lewis donation or acceptance of electron pairs. The topic includes pH, pOH, ionisation and water equilibrium, plus salt formation and hydrolysis, where a salt solution may become acidic, basic or neutral.
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