A) Burning of sulphur or sulphide ores in air to generate \[S{{O}_{2}}\].
B) Conversion of \[S{{O}_{2}}\] to \[S{{O}_{3}}\] by the reaction with oxygen in presence of catalyst.
C) Absorption of \[S{{O}_{3}}\] in \[{{H}_{2}}S{{O}_{4}}\] to give oleum.
D) Both [b] and [c]
Correct Answer: B
Solution :
[b] The key step in the manufacture of \[{{H}_{2}}S{{O}_{4}}\] is catalytic oxidation of \[S{{O}_{2}}\] with \[{{O}_{2}}\] to give \[S{{O}_{3}}\]in presence of \[{{V}_{2}}{{O}_{5}}\].
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