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ICSE Class 10 Answered

What are the steps involved in the contact process of manufacture of sulphuric acid.   
Asked by Topperlearning User | 21 Apr, 2016, 09:00: AM
answered-by-expert Expert Answer

Steps Involved in the Contact process

  1. Production of Sulphur Dioxide

SO2 is produced by roasting metallic sulphides in air.

4FeS2 +11O2 → 2Fe2O3 + 8SO2 

  1. Purification of Gases

To enhance the efficiency of a catalyst, various impurities present in the mixture of sulphur dioxide and air are first removed.

  1. Catalytic Oxidation of Sulphur Dioxide

Oxidation of SO2 to SO3 at 450°C in the presence of catalyst vanadium pentaoxide.

  1. Absorption of Sulphur Trioxide in Sulphuric Acid

Sulphur trioxide vapours are absorbed by a stream of conc. sulphuric acid.

SO3 + H2SO4 → H2S2O7 (oleum or pyrosulphuric acid)

  1. Dilution of Oleum to Obtain Sulphuric Acid

A calculated amount of water is added to obtain sulphuric acid of desired strength.

H2S2O7 + H2O → 2H2SO4

Answered by | 21 Apr, 2016, 11:00: AM

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