WAEC 2025
If acidified K\(_2\)Cr\(_2\)O\(_7\) acts as an oxidizing agent, the colour changes from
- Aorange to red
- Byellow to green
- Corange to green
- Dyellow to red
Explanation
Acidified potassium dichromate(VI) contains orange dichromate ions (Cr2O7^2-), which are reduced to green chromium(III) ions (Cr^3+) when it acts as an oxidizing agent.
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