Iron and sulphur do not react on mixing but on heating they combine to form iron sulphide
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Explanation:
When iron filings and sulphur powder are mixed, both retain their properties. It means they have not undergone any chemical reaction. ... When iron filings and sulphur powder are mixed and heated they undergo a chemical reaction and form ferrous sulphide (FeS)
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Answer :On heating the reaction mixture, the sulfur melts and reacts with the iron exothermically to form iron(II) sulfide.
Explanation: The mineral wool plug in the mouth of the test tube prevents sulfur vapour escaping and possibly catching fire.
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