A. turns lime water milky
B. decolorizes bromine water
C. gives a pop sound
D. turns lead(ii)ethanoate paper black
Correct Answer:
Option D – turns lead(ii)ethanoate paper black
Explanation
– Iron sulfide reacts with hydrochloric acid, releasing hydrogen sulfide: FeS + 2HCl → FeCl2 + H2S.
– Hydrogen sulfide reacts with lead acetate to form lead sulfide and thus produces a coloration on the paper which will vary from yellow to black, depending upon the amount of hydrogen sulfide present.
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