1.

Acidified potassium dichromate is treated with hydrogen sulphide, IN this reaction, the oxidation number of chormium :

Answer»

INCREASE from +3 to +6
decreases from + 6 to +3
REMAINS unchanged
decreases from + 6 + 2.

Solution :`Cr_(2)O_(7)^(2-) (+6) to Cr^(3+) (3) `


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