what occurs in the "testing box" in contact process for the manufacture of sulphuric acid?
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In preparation of H2SO4, Arsenic oxide is formed which is a poison for the catalyst. It is removed when the gas is passed over ferric hydroxide.
As2O3 + 2Fe(OH)3 ------------> 2FeAsO3 + 3H2O
In order to remove traces of As2O3, it is passed through a test box, where a strong beam of light is thrown against the gas. If there is no scattering of light in the box, it indicates that gas is free from As2O3.
As2O3 + 2Fe(OH)3 ------------> 2FeAsO3 + 3H2O
In order to remove traces of As2O3, it is passed through a test box, where a strong beam of light is thrown against the gas. If there is no scattering of light in the box, it indicates that gas is free from As2O3.
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