Cambridge IGCSE · Chemistry (0620)

Identification of ions and gases: Practice Questions

5 multiple-choice questions marked as you go, and 3 written questions with worked solutions. All on Identification of ions and gases.

8 questions16 marksFree, no account

Question 1

1 mark

Which flame color is observed when a sample containing potassium ions is placed in a Bunsen burner flame?
\( (K^{+}) \)

Question 2

1 mark

A student tests an unknown solution by adding dilute nitric acid followed by aqueous silver nitrate. A white precipitate forms.
Which ion is present in the solution?

Question 3

1 mark

A student is given an unknown solid. They dissolve it in water and add aqueous sodium hydroxide followed by aluminium foil and warm the mixture gently. A gas is evolved that turns damp red litmus paper blue.
Which ion is identified by this procedure?

Question 4

1 mark

Which observation is correct when excess aqueous ammonia is added to a solution containing copper(II) ions \( (Cu^{2+}) \)?

Question 5

1 mark

A salt solution is tested.
1. Adding aqueous sodium hydroxide produces a red-brown precipitate.
2. Acidifying with dilute nitric acid followed by aqueous barium nitrate produces a white precipitate.
What is the identity of the salt?

Question 6

2 marks

Describe the chemical test and the positive result used to identify hydrogen gas, \(H_2\).

Write your answer out first, then check it against the worked solution.

Question 7

4 marks

Describe the two reagents added to an aqueous solution to test for the presence of chloride ions, \(Cl^-\), and state the observation for a positive result.

Write your answer out first, then check it against the worked solution.

Question 8

5 marks

A student tests an unknown solution by adding acidified aqueous potassium manganate(VII). The purple solution turns colorless. Identify the anion present and explain the type of reaction occurring.

Write your answer out first, then check it against the worked solution.

* The content provided by thinka is generated by AI and may not always be accurate or up-to-date. Please use it as a supplementary resource and verify with official materials.

You've seen the model answer. Now get yours marked.

This page can show you how a good answer looks. It cannot tell you what your answer was missing. thinka marks your written work against the real mark scheme in about 15 seconds.

Get My Answers Marked Back to the notes

Want more questions like these? Get a fresh set on this topic, graded as you go.

Practice More