Acidified potassium dichromate is treated with hydrogen sulphide. In the reaction, the oxidation number of chromium
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a
Increases from + 3 to + 6
b
Decreases from +6 to +3
c
Remains unchanged
d
Decreases from +6 to +2
answer is B.
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Detailed Solution
Decreases from + 6 to + 3.K2Cr2O7+4H2SO4→K2SO4+Cr2SO43+4H2O+3OH2S+O→S+H2O×3--------------------------------------------------------------------------------K2Cr2O7+6+4H2SO4+3H2S→K2SO4+Cr2+3SO43+7H2O+3S