Describe how the gas is passed through limewater in test 1. You may use a labelled diagram to support your answer.
Describe two further observations that the student records in test 1.
Identify the gas made in test 1.
Y contains one anion. Use the observations from test 1 to identify this anion.
Use the observations from test 2 to identify the dilute acid used in test 1.
Identify the cation in Y using the observations from tests 3 and 4.
Solution Z is colourless. The student thinks that Z contains $\text{Cu}^{2+}$ ions. State why the student is incorrect.
Solution Z contains $\text{K}^+$ ions. Describe how to carry out a flame test on solution Z to confirm the identity of this cation.
Solution Z contains ions of a Group VII element. Describe a test and the possible results used to identify which Group VII ion is present in Z.