試題詳解

30. Which of the following statements is correct?
(A) NaF: acidic, cation acts as an acid )
(B)NH₄CI: neutral, cation acts as an acid, and anion acts as
(C) KCN: basic, cation is from strong base； anion is from strong acid
(D) AI(NO₃)₃: neutral, cation is from strong base； anion is from strong acid
(E) FeCl₃: acidic, hydrated cation acts as an acid