Question

What is the oxidation state of chromium in \( \text{K}_2\text{Cr}_2\text{O}_7 \)?

• A. +2
• B. +3
• C. +6
• D. +7

Hint:

Remember: The oxidation state of oxygen is usually \( -2 \), and the oxidation state of alkali metals like potassium is \( +1 \). Use the sum of oxidation states to find the unknown oxidation state.