| 1. | If acidified Potassium Dichromate(VI) (K₂Cr₂O₇) acts as oxidizing agent, color changes from |
| a. | orange to red |
| b. | orange to green |
| c. | yellow to green |
| d. | yellow to red |
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Answer: (c).yellow to green
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| 2. | In an acidified solution of Potassium Dichromate(VI) (K₂Cr₂O₇), Dichromate ion (Cr₂O₇-2) becomes reduced to |
| a. | Chromate (V) ions |
| b. | Chromium (III) ions |
| c. | Chromium (II) ions |
| d. | Chromium (VI) ions |
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Answer: (b).Chromium (III) ions
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| 3. | Oxidation involves |
| a. | loss of hydrogen |
| b. | loss of oxygen |
| c. | gain in hydrogen |
| d. | gain in electrons |
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Answer: (a).loss of hydrogen
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| 4. | In a reaction between CuSO₄(s) and Zn(s), |
| a. | Zinc experiences an increase in the oxidation state |
| b. | undergoes oxidation |
| c. | Zinc undergoes oxidation |
| d. | all of these |
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Answer: (d).all of these
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| 5. | Old paintings became discolourised due to |
| a. | Lead Sulphide PbS |
| b. | Lead Sulphate PbSO₄ |
| c. | Lead Chloride PbCl₂ |
| d. | Lead Oxide PbO |
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Answer: (a).Lead Sulphide PbS
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