Redox Reactions Multiple Choice Questions with Answers – PDF Download

MCQ 1: If acidified Potassium Dichromate(VI) (K₂Cr₂O₇) acts as oxidizing agent, color changes from:

1. orange to red
2. orange to green
3. yellow to green
4. yellow to red

MCQ 2: In an acidified solution of Potassium Dichromate(VI) (K₂Cr₂O₇), Dichromate ion (Cr₂O₇^-2) becomes reduced to:

1. Chromate (V) ions
2. Chromium (III) ions
3. Chromium (II) ions
4. Chromium (VI) ions

MCQ 3: In a reaction between CuSO_4(s) and Zn_(s),:

1. Zinc experiences an increase in the oxidation state
2. Zinc experiences a decrease in the oxidation state
3. Zinc undergoes reduction
4. none of above

MCQ 4: Old paintings became decolorized due to:

1. Lead Sulphide PbS
2. Lead Sulphate PbSO₄
3. Lead Chloride PbCl₂
4. Lead Oxide PbO

MCQ 5: In a reaction between CuSO_4(s) and Zn_(s),:

1. copper gains electrons
2. copper is being reduced
3. copper experiences a decrease in oxidation state
4. all of above