Question
Aqueous iron(III) chloride, FeCl3, reacts with aqueous potassium iodide, KI.
vFeCl3 + wKI → xFeCl2 + yKCl + I2
Which statements are correct?
- In the balanced equation, v, w, x and y have the same value.
- Potassium iodide is an oxidizing agent.
- A dark brown solution is produced in the reaction.
A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3
Answer/Explanation
Ans:
B
Question
Magnesium reacts with copper(II) oxide to give magnesium oxide and copper.
Which substance is the oxidising agent in this reaction?
A copper
B copper(II) oxide
C magnesium
D magnesium oxide
Answer/Explanation
Ans: B
Question
An example of a redox reaction is shown.
\(Zn + Cu_{2+} \rightarrow Zn_{2+} + Cu\)
Which statement about the reaction is correct?
A Zn is the oxidising agent and it oxidises \(Cu^{2+}\).
B Zn is the oxidising agent and it reduces \(Cu^{2+}\).
C Zn is the reducing agent and it oxidises \(Cu^{2+}\).
D Zn is the reducing agent and it reduces \(Cu^{2+}\).
Answer/Explanation
Ans: D
Question
Iron(II) chloride solution reacts with chlorine gas.
The equation is shown.
\(2FeCl_2(aq) + Cl_2(g) → 2FeCl_3(aq)\)
Which statements about this reaction are correct?
1 \(Fe^{2+}\) ions are reduced to \(Fe^{3+}\) ions.
2 Chlorine acts as a reducing agent.
3 \(Fe^{2+}\) ions each lose an electron.
4 \(Cl_2\) molecules are reduced to \(Cl^–\) ions.
A 1 and 2 B 2 and 3 C 2 and 4 D 3 and 4
Answer/Explanation
Ans: D