Solids, Liquids, and Gases

AP Chemistry· difficulty 3/5

At the triple point of a phase diagram,

A
$It's a forbidden region$
B
$Only solid exists$
C
$Two liquids coexist$
D
$Solid, liquid, and gas phases coexist in equilibrium$
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Explanation

All three phases meet at a single (T, P) point. For water, triple point is at 0.01 °C and 611 Pa.

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