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If acidified potassium dichromate(VI) (K2Cr2O7)…

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CHEMISTRY

If acidified potassium dichromate(VI) (K2Cr2O7) acts as oxidizing agent, color changes from

  • A. Yellow to green
  • B. Orange to green
  • C. Yellow to red
  • D. Orange to red

QUICK ANSWER…

B

SOLUTION 

Acidified potassium dichromate(VI) is a powerful oxidizing agent (often seen as more powerful than potassium permanganate), it is used in the laboratory to add oxygen to compounds. Its normal color is orange, but gradually changes to green in the presence of a reducing agent.

Now for the right answer to the above question:

  1. Option A is incorrect. The normal color of potassium dichromate(VI) is not yellow and so, this option cannot possibly be the answer.
  2. Option B is correct. Potassium dichromate(VI) is orange in color and is an oxidizing agent which changes to green in the presence of a reducing agent.
  3. C is incorrect. Again, the natural color of potassium dichromate(VI) is not yellow and so, this option too cannot possibly be the answer
  4. D is not the correct answer. Although the original color of potassium dichromate(VI) is orange, it does not change to red in the presence of a reducing agent.

QUICK TIPS…

You may please note these/this:

  • The color of potassium dichromate(VI) is orange, while that of a similar oxidizing agent called potassium permanganate is purple.

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/culled from 2019 JAMB-UTME Chemistry question 26/

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