Water from a river in an agricultural region contains $\text{NH}_4^+$, $\text{CO}_3^{2-}$, $\text{HCO}_3^-$, $\text{Cl}^-$ and $\text{NO}_3^-$ ions. At a water treatment plant, a calculated amount of calcium hydroxide is added to treat this water. Which substance is formed as a precipitate when calcium hydroxide is added to the river water?
- A$\text{CaCl}_2$
- B$\text{CaCO}_3$
- C$\text{Ca(NO}_3)_2$
- D$\text{NH}_4\text{OH}$