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
791–800 of 869
Question 791
3 marks · Easy
Answer and see the solution →A student tested three samples of gas (A, B, and C) using damp red litmus paper. Their results are recorded in the table below.
Results of gas tests using damp red litmus paper Sample Observation A Red litmus paper turns blue B No change C Red litmus paper turns white (a)[1 mark]Identify the sample that contains ammonia.
(b)[1 mark]Give a reason for your answer to part (a).
(c)[1 mark]Suggest the gas that could be present in sample C.
Question 792
1 mark · Easy
Answer and see the solution →State the melting (freezing) point of pure water at 1 atmosphere pressure.
Question 793
3 marks · Easy
Answer and see the solution →(a)[2 marks]Describe the steps for testing a sample for ammonia gas using litmus paper.
(b)[1 mark]Explain why the litmus paper must be damp.
Question 794
2 marks · Easy
Answer and see the solution →A water sample was tested and its boiling point found to be 101.5°C at 1 atmosphere pressure. Calculate by how much the boiling point differs from that of pure water. Is the sample likely to be pure?
Question 795
2 marks · Easy
Answer and see the solution →A student carries out a test for ammonia gas using damp red litmus paper. The student expects to see the colour of the paper change. If the student starts with 5 pieces of damp red litmus paper and plans one test for each of 5 gas samples, how many pieces of red litmus paper will change colour if all 5 samples are ammonia gas? State the final colour of the litmus paper.
Question 796
2 marks · Normal
Answer and see the solution →State the result of the test for ammonia gas using damp red litmus paper. Explain why this result occurs.
Question 797
4 marks · Normal
Answer and see the solution →A student is given an unknown liquid and asked to test for the presence and purity of water.
(a)[2 marks]Describe how the student could use anhydrous copper(II) sulfate to test for the presence of water in the liquid.
(b)[2 marks]Explain how the student could determine if the liquid is pure water.
Question 798
3 marks · Normal
Answer and see the solution →A sample of gas in a test-tube is suspected to be ammonia. A student tests this gas using damp red litmus paper. He repeats the test with chlorine gas for comparison.
(a)[1 mark]State the result when ammonia gas is tested with damp red litmus paper.
(b)[1 mark]State the result when chlorine gas is tested with damp red litmus paper.
(c)[1 mark]Explain how these tests can be used to identify ammonia gas in a mixture of alkaline and acidic gases.
Question 799
3 marks · Normal
Answer and see the solution →A student tests two samples, A and B, for water. Both samples turn white anhydrous copper(II) sulfate blue. When heated, sample A boils at 102°C and sample B boils at 100°C (at 1 atm pressure).
Explain, with reasons, which sample is pure water and which is not.
Question 800
4 marks · Normal
Answer and see the solution →A student is given a colourless liquid and asked to determine if it is pure water. The student has access to anhydrous copper(II) sulfate, a thermometer, a beaker, and a Bunsen burner.
(a)[2 marks]Describe how the student could use anhydrous copper(II) sulfate to test whether the liquid contains water.
(b)[1 mark]State the colour change that would be seen if water is present.
(c)[1 mark]Describe how the student can use a thermometer and a Bunsen burner to test if the water is pure.