`SO_3` when absorbed in 98% `H_2SO_4` it forms
A. More concentrated `H_2SO_4 `
B. `H_2SO_3`
C. `H_2S_2O_8`
D. `H_2S_2O_7`

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1 Answers

Correct Answer - D
`H_2SO_4 +SO_3to underset("Oleum")(H_2S_2O_7)`

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