Final answer:
A) Strong acid. HNO₃ is classified as a strong acid because it fully dissociates into ions when dissolved in water, unlike weak acids or non-electrolytes.
Step-by-step explanation:
HNO₃, or nitric acid, is classified as a strong acid. When dissolved in water, strong acids almost completely dissociate into ions. In the case of HNO₃, it fully ionizes to form H⁺ and NO₃⁻ ions in solution, indicating that it is indeed a strong acid. Just as HCl is confirmed to be a strong acid based on Table 10.2.1, HNO₃ can be similarly classified due to its complete ionization in aqueous solutions.
Hence, it has a very high degree of electrical conductivity when dissolved in water, further supporting its classification as a strong acid. This differentiates it from weak acids like NH3, which do not fully dissociate, or non-electrolytes that do not dissociate at all in solution.