Answer to Question #42071 in Inorganic Chemistry for Abdulwadud

Question #42071
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
Expert's answer
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

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