2 in which substance are molecules rigidly arranged 1. water in a freezer at -2degree C 2. water in cup at 22degree C 3. water in a pot at 100degree C 4.water in a steam engine at 110degree C?

The answer you are probably looking for is 1. water in a freezer. Particles in a solid have fixed positions. Rigid is perhaps a misleading Word to use, however, as the particles are not still but vibrating around their fixed positions.