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Question

Which of the following is not correct oleum strength?

A
105%
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B
120%
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C
122%
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D
127%
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Solution

The correct option is D 127%
Oleum strength lies in between 100% to 122.5%
122.5% is the upper limit because the percentage of free SO3 in 122.5% sample comes out to be 100%.

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