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
801–810 of 869
Question 801
3 marks · Normal
Answer and see the solution →A student measures the volume of a gas collected during a chemical reaction. She suspects it is ammonia. The laboratory temperature is 22°C and the gas is bubbled through 20 cm³ of water. The final pH of the water is found to be 12.2. Pure water has a pH of 7.0.
By how many units did the pH of the water increase? What does this pH reading suggest about the nature of the gas?
Question 802
3 marks · Normal
Answer and see the solution →Water found in a river is tested using anhydrous copper(II) sulfate. The solid turns blue. Explain why this test does not prove the water is pure, and suggest a further test to check its purity.
Question 803
4 marks · Normal
Answer and see the solution →A teacher tests four gases (W, X, Y, Z) using both damp red litmus paper and universal indicator paper. The results are shown.
Colour change results of gas tests Gas Red litmus paper Universal indicator paper W No change No change X Turns blue Turns blue Y No change Turns red Z Bleaches Bleaches (a)[2 marks]Which gas (W, X, Y, or Z) is most likely to be ammonia? Explain your answer.
(b)[2 marks]Suggest the identity of one other gas (Y or Z), giving a reason.
Question 804
2 marks · Normal
Answer and see the solution →A student is given a sample of gas and uses a piece of damp red litmus paper to test it.
State the result if the gas is ammonia. Explain why this result is seen.
Question 805
2 marks · Hard
Answer and see the solution →A colourless liquid is suspected to contain water, but may also have dissolved salts. You are given a thermometer and a Bunsen burner. State how you would use these to test for the purity of the water and describe what result confirms that it is pure.
Question 806
5 marks · Hard
Answer and see the solution →A student is given three unknown gases: Gas A, Gas B, and Gas C. She is told that one may be ammonia, another is hydrogen, and the third is chlorine. She uses damp red litmus paper to test each gas.
(a)[1 mark]State what is observed when damp red litmus paper is placed in ammonia gas.
(b)[1 mark]Describe what happens to damp red litmus paper when it is exposed to chlorine gas.
(c)[2 marks]Explain why ammonia is the only alkaline gas among the three.
(d)[1 mark]Suggest an additional chemical test to identify hydrogen, apart from using litmus paper. State what result confirms hydrogen is present.
Question 807
2 marks · Hard
Answer and see the solution →A student performs a test for water using anhydrous copper(II) sulfate. The white powder turns blue when a sample liquid is added. State what this test does and does not show about the sample.
Question 808
1 mark · Easy
Answer and see the solution →State the name of the gas given off when dilute hydrochloric acid is added to a carbonate compound.
Question 809
3 marks · Easy
Answer and see the solution →(a)[1 mark]State the reagent added to a sample to test for carbonate ions.
(b)[1 mark]Describe what you would observe if carbonate ions are present after adding this reagent.
(c)[1 mark]Explain how you would confirm that the gas produced is carbon dioxide.
Question 810
3 marks · Easy
Answer and see the solution →Test results for carbonate ions. Sample Dilute acid added Fizzing observed Gas turns limewater cloudy X Yes Yes Yes Y Yes No - Z Yes Yes No (a)[1 mark]Which sample(s) most likely contain carbonate ions? Explain your answer.
(b)[1 mark]Suggest a possible identity for the gas produced from sample Z.
(c)[1 mark]Explain why sample Y does not give the same results as X.