is it true that hot water freezes faster than cold water??

Answer 1

As odd as this sounds, it can be true. Freezing water is like freezing molten metals. Depending on the gory details of the liquid and the mold (volume, shape, thermal conductivity, etc), a higher pouring temperature will create more thermal convection of the liquid in the mold. This increased thermal convection increases heat transfer from the liquid to the mold and to the environment. The convection also contributes to homogenous nucleation (like seeding the center of the mold with tiny nuclei which increase the freezing rate).

I hope this helps

Answer 2

No... cold water is closer to the frezzing point unlike hot water