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An aqueous solution of gas ‘A’ gave the ...

An aqueous solution of gas ‘A’ gave the following data (reactions):
On boiling with `H_(2)O_(2)` followed by cooling and then adding an aqueous solution of `BaCl_(2)`, a white precipitate insoluble in dilute HCl was obtained.

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`H_(2)O_(2)+SO_(2)overset("Boil")rarrH_(2)SO_(4)`
`H_(2)SO_(4)+BaCl_(2)rarrunderset(("white ppt."))(BaSO_(4))+2HCl`
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