Question

Iron fillings 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 hydrochloric acid
was added to both the Parts and evolution of gas was seen in both the casesClassify Part ‘A’ and Part ‘B’ into elements, compounds and mixtures.

Answer 1

Answer:

Explanation: Part A  Fe (s) + S (s) Heat FeS (s)  FeS + 2 HCl (aq) → FeCl2 + H2 S  Part B  Fe (s) + S (s)→ Mixture of iron filings and sulphur  When dilute HCl is added to it  Fe (s) + S (s) + 2 HCl (aq) → FeCl2 + H2 gas  Sulphur remains unreacted  H2S gas formed has a foul smell and on passing through lead acetate solution, it turns the solution black. Hydrogen gas burns with a pop sound.