Q.

Acidified potassium dichromate is treated with hydrogen sulphide. In the reaction, the oxidation number of chromium

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By Expert Faculty of Sri Chaitanya

Increases from + 3 to + 6

Decreases from +6 to +3

Remains unchanged

Decreases from +6 to +2

answer is 2.

(Detailed Solution Below)

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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

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