Aqueous sodium hydroxide is used to identify the ions present in the aqueous solutions of compounds Q and R. The outcomes are displayed. Which row is correct?
- Aion in compound Q: $\text{Cr}^{3+}$; ion in compound R: $\text{NH}_4^+$
- Bion in compound Q: $\text{Cu}^{2+}$; ion in compound R: $\text{CO}_3^{2-}$
- Cion in compound Q: $\text{Fe}^{2+}$; ion in compound R: $\text{CO}_3^{2-}$
- Dion in compound Q: $\text{Fe}^{3+}$; ion in compound R: $\text{NH}_4^+$