Contact process is the commercial method of manufacturing Sulphuric acid.The principal step involved in contact process  is

  1. A

    2SO2+O2723K, 1-2atmV2O52SO3

  2. B

    4FeS2+11O2 2Fe2O3+8SO2

  3. C

    H2SO4+SO3  H2S2O7

  4. D

    H2S2O7+H2O  2H2SO4

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    Solution:

    2SO2+O2723K, 1-2atmV2O52SO3  is the principal step involved in contact process.

    SO3 formed is absorbed using conc. sulphuric acid to form Oleum.

    Oleum on dilution gives conc.sulphuric acid.

    Greater the yield of SO3 greater will be the yield of sulphuric acid.

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