1. B) - Two independent properties serve to specify the state. 2. B) - The locus of all points where the second law is satisfied. 3. B) - Is the p-T coordinates at which solid, liquid and vapour co-exist in equlibrium. Solution 1. B) - Two independent properties serve to specify the state. 2. B) - The locus of all points where the second law is satisfied. 3. B) - Is the p-T coordinates at which solid, liquid and vapour co-exist in equlibrium..