Separate tests are carried out on two samples of a colourless solution using aqueous sodium hydroxide, $\text{NaOH(aq)}$, and aqueous ammonia, $\text{NH}_3\text{(aq)}$, and the observations are noted. • A white precipitate appears when two drops of $\text{NaOH(aq)}$ are added. In excess $\text{NaOH(aq)}$, this precipitate dissolves. • A white precipitate appears when two drops of $\text{NH}_3\text{(aq)}$ are added. In excess $\text{NH}_3\text{(aq)}$, this precipitate dissolves. What conclusion can be drawn from these observations?
- AThe anion present is $\text{Cl}^-$.
- BThe anion present is not $\text{Cl}^-$.
- CThe cation present is $\text{Al}^{3+}$.
- DThe cation present is $\text{Zn}^{2+}$.