When a pure substance is changing phase from a SOLID to a GA

When a pure substance is changing phase from a SOLID to a GAS, during a process called sublimation, which of the following sets of two properties are NOT independent? T and p T and v u and v v and p T and u u and p When a pure substance is changing phase from a solid to a gas, during a process called sublimation, which of the following sets of two properties are NOT independent? p and v p and x p and T v and x x and T T and v

Solution

Here question 1 and 2 are the same

For question 1 answer is option 1 and for question 2 its option 3

Since

The vapour pressure of a substance increases as temperature increases.Sublimation occurs when total atmospheric pressure is less than the vapour pressure of the compound and also melting should not start as the compound is not hot enough to melt.

So it depends on temperature and pressure only but not on volume and dryness fraction.