Question

why naphthalene balls disappear at with time without leaving any solid ​

Answer 1

Naphthalene Balls

Naphthalene balls disappear at with time without leaving any solid because it goes through the process called sublimation. It's melting point is same as that of the point required it to change into gaseous state.

Answer 2

This happens due to sublimation

Napthalene balls sublime.

Sublimation us a process in which the solid directly gets converted into gas without going through the liquid state

Eg dry ice

I hope this helps ( ╹▽╹ )