Multiple choice general knowledge science & technology

indian red is

  1. zinc sulphate

  2. ferric oxide

  3. ferrous oxide

  4. alumunium sulphate
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Indian red is ferric oxide (Fe2O3), a naturally occurring red pigment used in paints and dyes. It's not zinc sulfate, ferrous oxide (FeO), or aluminum sulfate - those are completely different compounds. The red color comes from the iron in the +3 oxidation state.

AI explanation

Indian red is a pigment made from ferric oxide (Fe2O3), the same iron oxide compound responsible for rust's reddish-brown color. It's historically used as a paint pigment and polishing compound (jeweler's rouge). Ferrous oxide (FeO) is a different, less stable oxidation state of iron and isn't the basis of this pigment.

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