Kunal took few iron turnings and mixed them well with sulphur powder. He could separate the iron turnings with the help of a magnet. He heated the mixture for some time and tried to separate the iron turnings with the magnet but he could not. Why?

• A.  On heating, a chemical change takes place and a new compound is formed.
• B.  On heating, iron becomes non-magnetic hence, it is not attracted by magnet.
• C.  On heating, a physical change takes place hence iron and sulphur gets mixed up.
• D.  On heating, iron evaporates and only sulphur is left behind.