1.

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

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


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