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10 questions from this quiz
Purple solution becomes colourless
MnO4−\text{MnO}_4^-MnO4− with E°E°E° = +1.33 V
Green
Oxidized back to Cr3+\text{Cr}^{3+}Cr3+
Same element oxidized and reduced together
Red litmus paper turns blue
Effervescence (fizzing)
Cream
Brown I2\text{I}_2I2 masks the green colour
To prevent false positives from other ions
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