**Category:** Inorganic Chemistry  
**Subtype:** Chemical Compounds  
**Problem:** Identify the correct chemical formula for potassium dichromate.  

**Options:**  
A. KCl  
B. \(\mathrm{KNO}_{3}\)  
C. \(\mathrm{K}_{2}\mathrm{Cr}_{2}\mathrm{O}_{7}\)