Question

The phase diagram for a pure substance is shown above. What characteristics does point $V$ represent?

• A. liquid$\rightleftharpoons$solid
• B. solid$\rightleftharpoons$vapour
• C. liquid$\rightleftharpoons$vapour
• D. solid$\rightleftharpoons$liquid$\rightleftharpoons$vapour

Answer 1

Answer: (D)

solid$\rightleftharpoons$liquid$\rightleftharpoons$vapour

At point V, all the three phases are present and this point is known as triple point.

At triple point, we have:

solid$\rightleftharpoons$liquid$\rightleftharpoons$vapour

Hence, option D is correct.