What is formed if a mixture of powdered iron and sulphur is heated in a test tube?

An element

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A mixture

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A compound

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None of the above

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Solution

The correct option is C A compound
A mixture is made when you combine matter in a way where the components can be separated again. A compound results from a chemical reaction between components, forming a new substance. For example, you can combine iron filings with sulfur to form a mixture. All it takes is a magnet to separate the iron from the sulfur. On the other hand, if you heat the iron and sulfur, you form iron sulfide, which is a compound.
$F e + S \to F e S$

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