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What is the characteristic of the gas liberated when dilute hydrochloric acid is added to Iron(ii)sulphide?

Chemistry
WAEC 2019

What is the characteristic of the gas liberated when dilute hydrochloric acid is added to Iron(ii)sulphide?

  • A. turns lime water milky
  • B. decolorizes bromine water
  • C. gives a pop sound
  • D. turns lead(ii)ethanoate paper black
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Correct Answer: Option D
Explanation

- Iron sulfide reacts with hydrochloric acid, releasing hydrogen sulfide: FeS + 2HCl → FeCl\(_2\) + H\(_2\)S.

- 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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