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Question

During the production of sulphuric acid by the contact process, the three reactions represented by the equations below occur.

S(l) + O2(g) → SO2(g)

2SO2(g) + O2(g) → 2SO3(g)

SO3(g) + H2SO4(l) → H2S2O7(l)

Which of the following statements is true for all three of these reactions?


  1. All occur at elevated pressures to ensure maximum yield.

  2. All take place at high temperatures to increase the reaction rate

  3. All are exothermic

  4. All are redox reactions


Solution

The correct option is C

All are exothermic


All are exothermic. 1 and 2 are redox, but 3 is not. High temperatures and pressures are not used for all reactions here. For example, 3 takes place rapidly and completely at room temperature and pressure, so elevated pressures and temperatures are not required.

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