North Carolina General Contractors Practice Exam 2025 - Free Contractors Practice Questions and Study Guide

The two main types of hydrated lime are indeed classified based on their physical properties and specific uses, which is reflected in the correct answer. Type S hydrated lime, known as "special" or "slaked," is used in applications that require a higher reactivity and finer particles. It's often employed in scenarios such as soil stabilization and in the production of certain types of mortars and plasters.

Type N, also referred to as "normal," has a lesser degree of reactivity and is generally used for more standard applications such as in general construction and maintenance projects where less reactivity is sufficient. This differentiation is important because the choice between Type S and Type N can impact the effectiveness of the construction material or reaction in specific scenarios.

The other options listed do not correspond to recognized classifications of hydrated lime, as common industry standards primarily recognize Type S and Type N as the key types. Hence, focusing on these two types provides a clear understanding of their unique properties and applications in the construction and building industry.