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Question

Sulphur trioxide gas is an important precursor to manufacture sulphuric acid. It is produced by the catalytic oxidation of SO2 gas. In the contact process, once we obtain SO3(g), Sulphuric acid is obtained by the hydrolysis of SO3(g). True or False?


A

True

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B

False

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Solution

The correct option is B

False


In the contact process catalytic oxidation happens as

2 SO2(g)+O2(g)2 SO3(g):ΔH=197kJ.mol1

The catalyst used is V2O5 – Vanadium pentoxide.

Now we know that SO3 is the anhydride of H2SO4. But in the actual contact process, the SO3 produced is cooled and absorbed in concentrated Sulphuric acid in a controlled manner. This yields oleum H2S2O7:

H2SO4(l)+SO3(g)H2S2O7(l)

This has two advantages:

  1. We can avoid the violently exothermic hydrolysis reaction of SO3. Controlling this exothermic reaction becomes impractical
  2. Further, the hydrolysis produces a mist of Sulphuric acid vapour, which could also be avoided

Oleum is diluted with water to produce Sulphuric acid. Could you try the reaction?

H2S2O7(l)+H2O(l)2H2SO4(l)


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