Final answer:
HNO2 is not a strong electrolyte as it is a weak acid and only partially ionizes in water. Examples of strong electrolytes include ionic compounds and strong acids.
Step-by-step explanation:
Out of the given options, HNO2 is not a strong electrolyte. Strong electrolytes are substances that completely dissociate into ions when dissolved in water.
Examples of strong electrolytes include ionic compounds and strong acids.
However, HNO2 is a weak acid and only partially ionizes in water. It dissociates into H+ and NO2- ions but to a lesser extent compared to strong acids.