Sahil took some iron fillings and mixed them well with sulphur powder. He could separate the iron fillings with the help of a magnet. Then, he heated the mixture for some time and tried to separate the iron filings with the magnet but he could not because

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On heating, a chemical change takes place and a new compound is formed

On heating, a physical change takes place hence, iron and sulphur get mixed up

On heating, iron evaporates and only sulphur is left behind

None of these

answer is A.

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Detailed Solution

On heating chemical reaction takes place between iron and sulphur to form iron sulphide, that’s why we are unable to separate.

$Fe + S \to FeS$ .

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