Question

what is the difference between the melting point of normal ice and dry ice?

Answer 1

Ice is the solid form of water, it has a melting point of zero degree Celsius where it changes its state form solid to liquid.
However, Dry ice which is solidified Carbon dioxide, does not have any melting point. It directly changes from solid to gas. Hence instead of melting, sublimation of dry ice occur.
Sublimation point of dry ice is -78.5 degree Celsius.