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Question

Silvery grey iron filings are added to yellow sulphur powder in a test tube. The contents of the test tube were strongly heated until they glow red. On cooling, it forms a grey dull solid. Which statement is correct about the contents of the test tube in the experiment?


A

At the end a compound is formed

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B

At start, they cannot be separated with a magnet

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C

At the end, they can be separated with a magnet

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D

At start, there is a compound

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Solution

Correct option: (B)

  • A compound results from a chemical reaction between components, forming a new substance.
  • When sulphur and iron filings are mixed and heated, form a black colour compound FeS (ferrous sulphide).
  • The chemical reaction can be represented as:
  • Fe+SFeS

Separation by magnet:

Initially, the iron and sulphur can be separated by the magnet because the iron pieces are attracted by the magnet while sulphur does not attract by a magnet.


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