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Passage - II : The solid(A) is a laboratory reagent. Give the following reactions.i) On strongly heating it gives two oxides of sulphur ii) On adding aqueous NaOH solution to its aqueous solution a dirty green precipitate is obtained, which starts turning brown on exposure to air. The solid A is

Answer»

`BaCl_(2)`
`FeSO_(4)`
`CaSO_(4)`
None of these

Solution :`FeSO_(4).7H_(2)OUNDERSET(-7H_(2)O) overset(300^(@)C)to 2FeSO_(4) overset("high T")to Fe_(2)O_(3)+SO_(2)+SO_(3)`.
`Fe_(2)(SO_(4))_(3)3NaOH to underset("DIRTY green ppt") (2Fe(OH)_(3)+Na_(2)SO_(4))` Oxides are `SO_(2),SO_(3)`.


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