Solid X contains two cations (positive ions) and one anion (negative ion).
One of the cations is Fe2+\text{Fe}^{2+}Fe2+.
The table describes the tests carried out on an aqueous solution of X and some of the observations made. Complete the table by giving the missing observation.
| Test | Observation |
|---|---|
| Add sodium hydroxide solution | [Missing Observation] |
| Then heat the mixture and test the gas given off with damp red litmus paper | Litmus paper turns blue |
| Add dilute nitric acid, then add a few drops of silver nitrate solution | Yellow precipitate forms |
Which cation, other than Fe2+\text{Fe}^{2+}Fe2+, is present in X? Explain your answer.
Identify the anion present in X.
When zinc is added to a solution containing Fe2+\text{Fe}^{2+}Fe2+ ions, a reaction occurs. The ionic equation for this reaction is:
Zn(s)+Fe2+(aq)→Zn2+(aq)+Fe(s) \text{Zn(s)} + \text{Fe}^{2+}(\text{aq}) \rightarrow \text{Zn}^{2+}(\text{aq}) + \text{Fe(s)} Zn(s)+Fe2+(aq)→Zn2+(aq)+Fe(s)Identify the reducing agent in this reaction and explain your choice.
