Iron filings and sulphur were mixed together and divided into two parts, A
and B. Part A was heated strongly while part B was not heated. Dilute
Sulphuric acid was added to both the parts and evolution of gas was seen in
both the cases. What are the gases which evolve in part A and B? Explain.
How will you identify the gases evolved?
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When iron mixed with sulphur and heated then it forms Ferrous sulphide (A) which on treatment with dilute HCl produces Ferrous chloride and Hydrogen sulphide gas. FeS + HCl →FeCl₂ + H₂S↑ If the mixture is not heated (B) remains as mixture (Fe + S) if it treated with dilute HCl then it produces Hydrogen gas along with Ferrous chloride . Since only iron reacts (Slowly) with HCl. (Fe + S) +2 HCl → FeCl₂ + H₂↑
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