Chromium is contained in compound $X$. • When 2 moles of compound $X$ react with exactly 3 moles of silicon. • The only substances formed in this reaction are 4 moles of chromium and 3 moles of a silicon compound in which silicon has oxidation state $+4$. • In this reaction, chromium and silicon are the only elements whose oxidation states change. What could compound $X$ be?
- A$\text{Cr}_2\text{O}_3$
- B$\text{Cr}_2\text{H}_6$
- C$\text{Cr}_2\text{H}_4$
- D$\text{Cr}_2\text{O}_4$