Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Electrolysis
198 practice questions
Topics covered
- Why things conduct electricity17 practice questions
- Passing electricity through compounds: electrolysis20 practice questions
- The electrolysis of molten compounds19 practice questions
- Electrolysis and redox19 practice questions
- The electrolysis of other molten substances19 practice questions
- The electrolysis of aqueous solutions18 practice questions
- The electrolysis of sodium chloride solution19 practice questions
- The electrolysis of copper(ii) sulfate solution using inert electrodes18 practice questions
- The electrolysis of some other solutions using inert electrodes19 practice questions
- What would happen with non-electrolytes?19 practice questions
Practice questions
151–160 of 198
Question 151
3 marks · Easy
Answer and see the solution →(a)[1 mark]A student electrolyses aqueous sodium nitrate using inert electrodes. State the product formed at the cathode.
(b)[1 mark]State the product formed at the anode.
(c)[1 mark]Write a half-equation for the reaction at the cathode.
Question 152
2 marks · Easy
Answer and see the solution →Calcium chloride solution is electrolysed using inert electrodes. Use the reactivity series to determine whether calcium or hydrogen is formed at the cathode. State your answer and give a reason.
Question 153
2 marks · Easy
Answer and see the solution →Explain why nitrate ions do not produce a gas at the anode during the electrolysis of aqueous sodium nitrate solution with inert electrodes.
Question 154
3 marks · Easy
Answer and see the solution →Ions present in three aqueous solutions Solution Cation(s) Anion(s) A K^+ Cl^- B Mg^{2+} SO_4^{2-} C Cu^{2+} NO_3^- (a)[1 mark]For solution B, state the product at the cathode when electrolysed using inert electrodes.
(b)[1 mark]For solution C, state the product at the anode when electrolysed using inert electrodes.
(c)[1 mark]For solution A, explain why this gas forms at the cathode instead of the metal.
Question 155
1 mark · Easy
Answer and see the solution →State whether aluminium or hydrogen is produced at the cathode during the electrolysis of aqueous aluminium sulfate using inert electrodes.
Question 156
3 marks · Easy
Answer and see the solution →(a)[1 mark]Name the ion that will produce oxygen gas at the anode during the electrolysis of aqueous potassium sulfate solution with inert electrodes.
(b)[1 mark]Write the ionic equation for the formation of oxygen at the anode.
(c)[1 mark]State another negative ion commonly found in salts that will also result in the formation of oxygen at the anode.
Question 157
2 marks · Easy
Answer and see the solution →A student electrolyses an aqueous solution of potassium nitrate using inert electrodes.
State the name of the product formed at:
(a)[1 mark]the cathode
(b)[1 mark]the anode
Question 158
2 marks · Normal
Answer and see the solution →State the products formed at the cathode and at the anode when dilute sodium sulfate solution is electrolysed using inert electrodes.
Question 159
4 marks · Normal
Answer and see the solution →Potassium chloride solution is electrolysed using inert electrodes.
(a)[1 mark]State whether hydrogen or potassium is formed at the cathode.
(b)[2 marks]Explain why this product is formed at the cathode, using the reactivity series.
(c)[1 mark]Name the product formed at the anode.
Question 160
3 marks · Normal
Answer and see the solution →Electrolysis of aqueous copper(II) nitrate solution was carried out using inert electrodes. No copper was deposited at the cathode.
Explain which products are formed at the cathode and anode, and why these products are formed.