Multiple choice

H2S gas in water acts as

  1. weak base

  2. strong base

  3. weak acid

  4. strong acids
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Hydrogen sulfide is slightly heavier than air; a mixture of H2S and air is explosive.Hydrogen sulfide acts as a reducing agent.Hydrogen sulfide is slightly soluble in water and acts as a weak acid, giving the hydrosulfide ion HS− and the sulphide ion S2−.A solution of hydrogen sulfide in water is initially clear but over time turns cloudy. This is due to the slow reaction of hydrogen sulfide with the oxygen dissolved in water, yielding elemental sulfur, which precipitates out.

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