1.

Oleum is:H_2S_2O_7,H_2S_2O_6,H_4S_2O_7,H_3S_2O_7.

Answer»

`H_2S_2O_7`
`H_2S_2O_6`
`H_4S_2O_7`
`H_3S_2O_7`

ANSWER :A


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