What will be the % labelling of oleum containing `40% SO_(3)` by mass ?
A. 109
B. 118
C. 113.5
D. 122.5

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1 Answers

Correct Answer - A
40% by mass `SO_(3)`
40 gm `SO_(3)` in 100 gm Oleum
Hence 109% labelled oleum

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