Answer to Question #42071 in Inorganic Chemistry for Abdulwadud

Question

A Yellow Solid P Burns Competely In Air To Give A Colourless Gas Q. The Gas Is Acidic To Litmus And DeColourised Acid Lifted PottassiumTetroxoManganet(7)Solution.When P Is Heated Strongly With Iron Filling A Black Solid R Is Formed. Treatment Of R With Dilute Hydrochloric Acid Produce A Gas S Which Blacken Lead 2 ethanoate paper. Identify p, q, r, s

Answer 1

P - sulfur S
Q - sulfur dioxide SO₂
R - iron sulfide FeS
S - hydrogen sulfide H₂S

Reaction equations:
S + O₂ --> SO₂
5SO₂ + 2KMnO₄ + 2H₂O --> K₂SO₄ + 2MnSO₄ + 2H₂SO₄
Fe + S --> FeS
FeS + 2HCl --> FeCl₂ + H₂S
Pb(OAc)₂ + H₂S --> PbS + 2HOAc