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Question

Which of the reaction is true with respect to H2S?

A
It turns ferric ions to ferrous ions.
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B
It turns SO2 to S
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C
It gives positive methylene blue test
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D
none of the above
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Solution

The correct options are
A It gives positive methylene blue test
C It turns ferric ions to ferrous ions.
D It turns SO2 to S
A.) H2S+2Fe+3SS0+2Fe2++2H+
H2S in this reaction is oxidized to elemental sulfur. At the same time, Fe+3 is reduced to Fe2+.
B.) 2H2S+SO23S+2H2O
Therefore, when hydrogen sulfide gas is passed through sulfur dioxide, then elemental sulfur is produced.
C.) H2S gives positive methylene blue test. In this test, hydrogen sulfide concerts N, N demethyle-p-phenylenediamine directly to methylene blue in the pressure of metal oxidizing agents.
Amount of sulfide present Intensity of methylene blue color.

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