Which of the following statement is correct for oleum ?

Options

A. It is prepared by adsorption of `SO_(3) ` in conc. `H_(2)SO_(4)`
B. It contains O–O groups
C. I has six OH groups
D. None of these

Answer

A

Explanation

`H_(2)SO_(4)(l)+SO_(3)(g) to H_(2)S_(2)O_(7) ` (leum)
Structure of oleum (pyrosulphuric acid) `H-O-overset(O)overset("||")underset(O)underset("||")S-O-overset(O)overset("||")underset(O)underset("||")S-O-H`