Question

Heating of platinum wire is physical change but heating of iron is called chemical change

Answer 1

Answer:

because iron turns into liquid upon melting

Explanation:

Answer 2

Answer:

This is so because platinum is having an extremely low reactivity, thats why it will not react when heated. It will convert to its liquid state, which is a physical change but when iron is heated, When iron is heated in air it reacts with oxygen to form the compound iron oxide which is a chemical change.

The reaction involved is

$4Fe + 3O_{2} -----------> 2Fe_{2}O_{3}$