Question

iron fillings and sulphur were mixed together and divided into 2 parts ,A and B. Part A was heated strongly while part B was not heated.Dilute hydrochloric acid was added to both the parts and evolution of gas was seen in both the cases. How will you identify the gases evolved ?

Answer 1

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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