Multiple choice general knowledge science & technology

k2cr2o7

  1. potassium chromate

  2. potassium dichromate

  3. potassium oxide

  4. potassium chromium oxide
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

K2Cr2O7 is potassium dichromate, with two K+ ions and one Cr2O7 2- ion. The dichromate ion is Cr2O7 2-, distinct from chromate (CrO4 2-). Potassium chromate would be K2CrO4. The name dichromate indicates two chromium atoms in the anion.

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