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Question
Complete the reaction mentioning all the products formed:
\[\ce{Cr2O^{2-}7 + 3H2S + 8H^+ ->}\]
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Solution
\[\ce{Cr2O^{2-}7 + 3H2S + 8H^+ -> 2Cr^{3+} + 7H2O + 3S}\]
Dichromate oxidises hydrogen sulphide to sulphur in an acidic medium.
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