Question

In the general phase diagram of water component system, the region that separates solid and liquid is called _______________

(a) Fusion curve

(b) Sublimation curve

(c) Metastable curve

(d) Critical curve

I had been asked this question in an interview.

I'd like to ask this question from Application of Phase Rule to One Component System topic in division Phase Rule of Engineering Chemistry I

Answer 1

Correct choice is (b) Sublimation curve

To explain I would say: In a water component system, sometimes the water may not undergo transition between solid to liquid instead directly gets converted from solid to vapor. This is a stable state where a small variation in composition or temperature may destroy the steadiness. This point is called sublimated curve.