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(A) The $H_2SO_4$ (sulfuric acid) is manufactured by the $Contact \ process$. In this process,sulfur dioxide $(SO_2)$ is oxidized to sulfur trioxide $

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Contact process

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(A) The $H_2SO_4$ (sulfuric acid) is manufactured by the $Contact \ process$. In this process,sulfur dioxide $(SO_2)$ is oxidized to sulfur trioxide $(SO_3)$ in the presence of a catalyst (vanadium pentoxide,$V_2O_5$),which is then absorbed in concentrated $H_2SO_4$ to form oleum $(H_2S_2O_7)$. Finally,oleum is diluted with water to obtain $H_2SO_4$ of the desired concentration.

Which process is used for the manufacture of $H_2SO_4$?

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