試題詳解

16. Which are the properties of ionic compounds?
 1. They are liquids or solid at room temperature. 2. They have high melting points.
 3. Solids do not conduct electricity, but liquids do. 4. All of ionic compounds can dissolve in water.
(A) all
(B) 1, 2, and 3
(C)1, 3, and 4
(D) 2, 3, and 4
(E) 2 and 4