Hydrogen sulphide gas can act as
A. an oxidizing agent
B. a dehydrating agent
C. a bleaching agent
D. a precipitating agent
Hydrogen sulphide gas is often used to precipitate insoluble or sparingly soluble salts out of solutions. Ions of metals like lead (ii) ion, chromium ions, and in fact transition metal ions, can effectively be precipitated from their solutions.
Now for the right answer to the above question:
- Option A is incorrect. hydrogen sulphide is in fact a powerful reducing agent and not an oxidizing agent.
- Option B is incorrect. a dehydrating agent reacts with another substance to remove water molecule(s).
- C is incorrect. higher oxides of sulphur, and not hydrogen sulphide, can act as bleaching agents.
- D is the correct answer. Hydrogen sulphide can precipitate insoluble metallic sulphides out of their solutions.
You may please note these/this:
- Hydrogen sulphide is even used in qualitative analysis to test for lead (ii) ions. A black precipitate of lead sulphide is a confirmation.
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/ culled from 2015 JAMB-UTME Chemistry past question 32 /
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