Mr. Jawed burnt an elemental sulfur powder on a bunsen burner and collected the smoke into a chamber. He further oxidized the gas that he collected in the chamber with a catalyst. What could possible be the gas generated after oxidation?
Correct answer: C. Sulfur trioxide
- A. Sulfur gas
- B. Sulfur dioxide
- C. Sulfur trioxide
- D. Hydrogen sulfide
Explanation
When elemental sulfur is burnt, it reacts with oxygen in the air to form sulfur dioxide gas (SO2), as shown by the following equation: S + O2 → SO2 Further oxidation of SO2 with a suitable catalyst, such as vanadium pentoxide (V2O5), can produce sulfur trioxide (SO3), as shown by the following equation: 2SO2 + O2 → 2SO3 Therefore, the gas generated after oxidation is sulfur trioxide (SO3).
This question appeared on the NUMS 2019 (cancelled sitting) paper, which you can sit online with every answer explained.
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Redox reactions involve oxidation and reduction occurring together, with electrons transferred between species or oxidation numbers changing. The topic covers assigning oxidation states, identifying oxidizing and reducing agents, balancing redox equations by oxidation number or half-reaction methods, and connecting chemical changes with galvanic and electrolytic cells.
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