Ammonium dichromate is heated to produce a green residue, the oxidation state of Cr in the residue is +x then x is -
Question
Ammonium dichromate is heated to produce a green residue, the oxidation state of Cr in the residue is +x then x is -
Solution
When ammonium dichromate ((NH4)2Cr2O7) is heated, it decomposes to produce nitrogen gas, water, and a green residue of chromium(III) oxide (Cr2O3).
The oxidation state of chromium in ammonium dichromate is +6. However, in the green residue of chromium(III) oxide, the oxidation state of chromium is +3.
Therefore, if we denote the oxidation state of Cr in the residue as +x, then x is 3.
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