Question

a solid X liquefies at 25 c .it changes back to solid at 20 c do you agree why

Answer 1

because of change in physical properties in the solid x 


i think it is ammonium chloride

Answer 2

Answer:

Every element below its melting point remains in solid state and above its melting point remains in liquid state.

So, yes below 25 degree Celsius it will be in solid state.