Question

chalk is an ionic compound. which is a property of all ionic com on a chalkboard?
a high melting point
hardness and brittleness
inability to dissolve in water
a multicolored appearance

Explanation:

Ionic compounds are held together by strong ionic bonds, which require a large amount of energy to break. This results in a high melting point as a characteristic property. Hardness and brittleness are not universal (some ionic compounds can be soft or malleable in different forms), many ionic compounds are soluble in water, and ionic compounds don't inherently have a multicolored appearance. So the property common to all ionic compounds among the options is a high melting point.

Answer:

a. a high melting point