Question

the liquid which turns into solid on heating/>?

Answer 1

eggs

Answer 2

http://physicsworld.com/cws/article/news/2004/sep/24/law-breaking-liquid-defies-the-rules

Answer 3

A liquid solution of α-cyclodextrine (αCD), water and 4-methylpyridine (4MP) turns from liquid to solid when heated to 45-75 degrees C. Apparently hydrogen bonds are the reason behind this effect.

Answer 4

ok @VV-EFF

Answer 5

This is not possible for a pure substance always in its stable thermodynamic state. But if you relax that requirement, it is a possibility for many substances. One obvious example is the cooking of a protein solution, mentioned above. Another is any thermoset polymer resin:

http://en.wikipedia.org/wiki/Thermosetting_polymer