1.

Sulphan' is

Answer»

a MIXTURE of `SO_(3)` and `H_(2)SO_(5)`
`100%` conc. `H_(2)SO_(5)`
a mixture of GYPSUM and conc. `H_(2)SO_(4)`
100% oleum (a mixture of 100%`SO_(3)` in 100% `H_(2)SO_(4)`

Answer :D


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