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
71–80 of 359 · Easy
Question 71
5 marks · Easy
Answer and see the solution →Iodine is unable to displace bromine from potassium bromide solution. Use knowledge of redox and electronic structure to answer the following:
(a)Explain, in terms of electron transfer, what occurs to the bromide ions in a displacement reaction with chlorine.
(b)[2 marks]State whether iodine acts as an oxidising agent or reducing agent in displacement reactions, and explain your answer.
(c)[3 marks]Using information about electronic configuration, explain why chlorine is more reactive than bromine.
Question 72
5 marks · Easy
Answer and see the solution →A student adds bromine water to a solution of potassium iodide.
(a)[1 mark]Write the ionic equation for the reaction that takes place.
(b)[2 marks]State and explain what you would observe when bromine water is added to potassium iodide solution.
(c)[2 marks]Predict whether a similar reaction would occur if the student added iodine solution to potassium bromide solution. Explain your answer in terms of halogen reactivity.
Question 73
1 mark · Easy
Answer and see the solution →State the approximate percentage by volume of oxygen in dry air.
Question 74
3 marks · Easy
Answer and see the solution →Describe how an experiment using phosphorus could be used to show the percentage of oxygen in air.
(a)[1 mark]State what happens to the phosphorus when it reacts in a jar of air.
(b)[1 mark]Describe how the volume of air changes during the experiment.
(c)[1 mark]Explain how the result of this change can be used to find the percentage of oxygen in air.
Question 75
2 marks · Easy
Answer and see the solution →A 250 cm³ sample of dry, unpolluted air is analysed.
Calculate the approximate volume of argon in the sample. Give your answer to 2 decimal places.
Question 76
2 marks · Easy
Answer and see the solution →Explain why it is important to use excess copper in the experiment to determine the percentage of oxygen in air using copper.
Question 77
3 marks · Easy
Answer and see the solution →The table below shows the major gases in dry, unpolluted air.
Main gases in dry air Gas Percentage by volume (%) Nitrogen Oxygen Argon Carbon dioxide Question 78
1 mark · Easy
Answer and see the solution →Name one substance (other than a metal) that can be used to remove oxygen from air in an experiment to determine its percentage.
Question 79
3 marks · Easy
Answer and see the solution →Answer the following about the gases in dry, unpolluted air.
(a)[1 mark]Name the most abundant gas in dry air.
(b)[1 mark]State the gas present in the smallest amount from the main four gases.
(c)[1 mark]Give the percentage by volume of carbon dioxide in dry air, to two decimal places.
Question 80
2 marks · Easy
Answer and see the solution →In an experiment to find the percentage of oxygen in air using iron filings, the total air volume at the start is 180 cm³. At the end, the volume is 143 cm³. Calculate the percentage of oxygen in the air. Give your answer to the nearest whole number.