Correct answer: (A) At 200 K, increasing pressure from 1 to 50 atm condenses gas to liquid.
Explanation
200 K is below the 216.8 K triple-point temperature. On compression at that temperature, gas becomes solid rather than equilibrium liquid, so A is false. The plotted coexistence curve and positively sloped solid–liquid boundary support the remaining statements.
More Phase Equilibria: Phase rule. Clausius- Clapeyron equation. Phase diagram of one component system: CO2, H2O, S; two component systems: liquid-vapor, liquid-liquid and solid-liquid systems. Fractional distillation. Azeotropes and Eutectics. questions
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