Question 2
"Wax melting is a chemical change." What can be said about this statement?
The right answer is the one marked above.
It is a physical change — the wax is still wax. So the statement is false. Let the melted wax cool and solid wax is back.
Needing heat is no evidence that a change is chemical — melting ice needs heat too. Nor is an unchanged colour decisive; plenty of chemical reactions leave the colour alone.