Redox Reactions MCQ (Multiple Choice Questions) PDF Download

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

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

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

Old paintings became decolorized due to

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

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