Which substances ionize when they dissolve?

A) covalent compounds

B) solids

C) ionic compounds

D) gases

Ionic compounds

Explanation:

What are ionic compounds?

Ionic compounds are compounds that are formed due to ionic bonds between atoms. Ionic bonds are formed between metallic atoms and non-metallic atoms.

What are examples of ionic compounds?

Examples of ionic compounds include, KCl, NaBr, MgCl₂, etc

How do ionic compound ionize in water?

Ionic compounds ionizes when dissolved in water to form mobile ions. When dissolved in water they may serve as electrolytes due to the presence of free ions which will be responsible for conduction of electricity. For example, NaCl ionizes to form Na⁺ (aq) and Cl⁻ (aq).