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Passage - II : The solid(A) is a labor...

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.
What is compound in dirty green ppt.

A

`Ca(OH)_(2)`

B

`Fe(OH)_(2)`

C

`Fe(OH)_(3)`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
C
`FeSO_(4).7H_(2)O underset(-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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