Step 1: Evaluate each assertion.- A. Specific heat of saturated water vapor at 100\(^{\circ}\)C is negative: Saturated vapor exists in equilibrium with its liquid phase. Adding heat to saturated steam causes it to superheat. To maintain saturation, compression is required. This compression work raises the temperature more than the added heat, necessitating heat removal to keep the temperature constant. Conversely, adiabatic expansion of saturated steam causes cooling and condensation. To prevent condensation and maintain saturation during expansion, heat must be supplied. Specific heat is defined per unit temperature change. Under specific conditions for saturated steam, it can be negative. Therefore, A is correct.- B. There is only one triple point of a substance: The triple point is the unique temperature and pressure at which a substance's solid, liquid, and gas phases coexist in thermodynamic equilibrium. For a pure substance, this is a single, fixed point. Thus, B is correct.- C. Boiling point of every liquid rises with increase in pressure: The boiling point is the temperature at which a liquid's vapor pressure equals the ambient pressure. Vapor pressure in all liquids increases with temperature. Consequently, to elevate the boiling temperature, the external pressure must be increased. Therefore, C is correct.- D. Latent heat can not become zero: Latent heat of vaporization is the energy needed to transform a substance from liquid to gas at constant temperature and pressure. As temperature and pressure increase along the boiling curve, the critical point is approached. At the critical point, the distinction between liquid and gas phases vanishes, and the latent heat of vaporization becomes zero. Therefore, D is incorrect.
Step 2: Identify the correct statements.Statements A, B, and C are correct.