Question

acids are characterized by a bitter taste. *
true
false
bases have a ph that is less than 7. *
true
false
a binary ionic compound is composed of two * metal cations
true
false
magnesium phosphide is an ionic compound. *
true
false

Explanation:

1. Acids are characterized by a sour taste, not a bitter taste.
2. Bases have a pH greater than 7, acids have a pH less than 7.
3. A binary ionic compound is composed of a metal cation and a non - metal anion, not two metal cations.
4. Magnesium phosphide ($Mg_3P_2$) is formed by the transfer of electrons from magnesium (metal) to phosphorus (non - metal), so it is an ionic compound.

Answer:

1. B. False
2. B. False
3. B. False
4. A. True