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
191–200 of 374 · Normal
Question 191
1 mark · Normal
Answer and check →Which of the following correctly describes the extraction of iron from iron(III) oxide in a blast furnace?
- A.Iron(III) oxide is reduced by carbon monoxide.
- B.Iron(III) oxide is reduced by hydrogen.
- C.Iron(III) oxide is electrolysed to form iron.
- D.Iron(III) oxide is oxidised by carbon.
Question 192
2 marks · Normal
Answer and see the solution →Explain, using the concept of reduction, what happens to iron ions during extraction from iron(III) oxide.
Question 193
4 marks · Normal
Answer and see the solution →(a)[2 marks]Describe one economic advantage of extracting iron by heating with carbon rather than by electrolysis.
(b)[2 marks]The chemical equation for extracting iron using carbon is:
In this reaction, state which substance is oxidised and which is reduced.
Question 194
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 195
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 196
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 197
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 198
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.
Question 199
2 marks · Normal
Answer and see the solution →Give one reason why electrolysis is used to extract aluminium, but iron is extracted by reduction with carbon.
Question 200
4 marks · Normal
Answer and see the solution →Scandium is a metal above carbon in the reactivity series. It can be extracted from its oxide by heating with calcium. Use your knowledge of the reactivity series to answer the questions.
(a)[2 marks]Explain why calcium can be used to extract scandium from its oxide.
(b)[2 marks]Suggest one reason, other than expense, why this method might not be widely used for large-scale scandium extraction.