Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Inorganic Chemistry
869 practice questions
Topics covered
- The Alkali Metals85 practice questions
- The Halogens86 practice questions
- Gases in the Atmosphere86 practice questions
- Reactivity Series163 practice questions
- Extraction and Uses of Metals128 practice questions
- Acids, Alkalis and Titrations83 practice questions
- Acids, Bases and Salt Preparations156 practice questions
- Chemical Tests68 practice questions
Practice questions
461–470 of 869
Question 461
2 marks · Easy
Answer and see the solution →A factory uses 18,000 kWh of electricity to extract 1 tonne of aluminium by electrolysis, while producing 1 tonne of iron by reduction with carbon uses 800 kWh. Calculate how many times more electricity is used to produce 1 tonne of aluminium than 1 tonne of iron. Give your answer to the nearest whole number.
Question 462
2 marks · Easy
Answer and see the solution →Manganese (a metal) can be extracted from its oxide, MnO2, by heating with aluminium powder. Explain why manganese can be extracted this way, and what this shows about its position in the reactivity series.
Question 463
1 mark · Easy
Answer and see the solution →State why copper, which is above carbon in the reactivity series, cannot be extracted from copper(II) oxide by heating with carbon.
Question 464
3 marks · Easy
Answer and see the solution →The diagram shows the extraction of aluminium from aluminium oxide.
Electrolysis cell for aluminium extraction Aluminium oxide is dissolved in molten cryolite and electrolysed.
(a)[1 mark]State the formula of aluminium oxide.
(b)[1 mark]Give the reason why cryolite is used in this process.
(c)[1 mark]Write the half-equation for the reaction at the cathode.
Question 465
2 marks · Easy
Answer and see the solution →A company is deciding whether to extract a metal by carbon reduction or electrolysis. It costs £70 to make 1 tonne of metal using carbon reduction and £780 to make 1 tonne of aluminium using electrolysis.
Calculate how much more expensive it is to produce aluminium by electrolysis rather than using carbon reduction.
Question 466
2 marks · Normal
Answer and see the solution →State why metals above carbon in the reactivity series cannot be extracted from their oxides by reduction with carbon.
Question 467
4 marks · Normal
Answer and see the solution →Aluminium is extracted from aluminium oxide using electrolysis.
(a)[1 mark]Name the substance in which aluminium oxide is dissolved for the electrolysis process.
(b)[1 mark]Write the ionic equation for the reaction at the cathode during the electrolysis of aluminium oxide.
(c)[1 mark]Write the ionic equation for the reaction at the anode during this process.
(d)[1 mark]Explain why the extraction of aluminium by electrolysis is much more expensive than extracting iron by reduction with carbon.
Question 468
3 marks · Normal
Answer and see the solution →Titanium cannot be extracted from its oxide using carbon. It is often extracted by heating titanium oxide with sodium or magnesium.
Explain why this method is expensive and give a reason why this process is used instead of reduction with carbon.
Question 469
4 marks · Normal
Answer and see the solution →The table shows some metals and whether they can be extracted from their oxides by using carbon.
(a)[0 marks]Extraction of Metals by Carbon Metal Extracted using carbon (Yes/No) Potassium No Iron Yes Aluminium No Copper Yes (b)[1 mark]Identify two metals from the table that cannot be extracted using carbon.
(c)[1 mark]Explain why potassium cannot be extracted by reduction with carbon.
(d)[1 mark]State the method used to extract aluminium from its ore.
(e)[1 mark]Describe why copper can be extracted by using carbon.
Question 470
1 mark · Normal
Answer and check →Which statement describes a correct feature of aluminium extraction by electrolysis?
- A.The process uses less electricity than iron extraction.
- B.Aluminium oxide is dissolved in molten cryolite.
- C.Aluminium forms at the anode as a gas.
- D.The anode reaction is Al^3+ + 3e^- -> Al.