Question
a.
colorless on reduction with Zn in acid and regained its color on re-oxidation
b.
colorless on oxidation and regained its color on reduction with Zn in acid
c.
more deep in color on reduction with Zn in acid and regained its color on re-oxidation
d.
more deep in color on oxidation and regained its color on reduction with Zn in acid
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