The key step in the manufacturing of $H_2SO_4$ by contact process is
- Aabsorption of $SO_3$ in $H_2SO_4$ to give oleum
- Bdilution of oleum with water
- Cburning of sulphur in air to generate $SO_2$
- Dcatalytic oxidation of $SO_2$ with $O_2$ to give $SO_3$
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