Triple point pressure of substances $\mathrm{A}, \mathrm{B}, \mathrm{C}$ and D are $0.2,0.5,0.8$ and 1.2 bar, respectively. The substance which sublimes under standard conditions on increasing temperature is
(a)A
(b)B
(c)C
(d)D
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
A solid sublimes at 1 bar if its triple-point pressure exceeds 1 bar (no liquid range at 1 bar): substance D (1.2 bar).