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Subject :NSO    Class : Class 7

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.

Ans 1:

Class : Class 8
the answer is A

Ans 2:

Class : Class 5

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