### Core Logic Materials are classified based on their electrical conductivity at room temperature: - Conductors: Conductivity range is generally between 10^4$10^4$ to 10^7text S m^-1$10^7\text{ S m}^{-1}$ for metals, but aqueous electrolytes and certain semi-metals fall in the intermediate 1$1$ to 10^3text S m^-1$10^3\text{ S m}^{-1}$ range broadly qualifying as conductors in the context of typical chemical classifications. - Semiconductors: 10^-6$10^{-6}$ to 10^4text S m^-1$10^4\text{ S m}^{-1}$ - Insulators: 10^-20$10^{-20}$ to 10^-10text S m^-1$10^{-10}\text{ S m}^{-1}$ Wait, typical values for metallic conductors are high, but comparing them strictly against the NCERT table: 2.1 times 10^3$2.1 \times 10^3$ (Conductor) 1.2 times 10$1.2 \times 10$ (Conductor) 3.91$3.91$ (Conductor) 1.0 times 10^3$1.0 \times 10^3$ (Conductor) 1.0 times 10^-16$1.0 \times 10^{-16}$ (Insulator) 1.5 times 10^-2$1.5 \times 10^{-2}$ (Semiconductor) 1.0 times 10^-7$1.0 \times 10^{-7}$ (Semiconductor / Insulator) ### Step 1: Final Counting The materials with conductivities 2.1 times 10^3$2.1 \times 10^3$, 1.2 times 10$1.2 \times 10$, 3.91$3.91$, and 1.0 times 10^3$1.0 \times 10^3$ fall into the category of conductors. Therefore, the number of conductors is 4$4$. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 12 Chemistry: Solid State Class 12 Chemistry: Electrochemistry