An unlabelled beaker contains dilute hydrochloric acid. A student adds a portion of this acid to two separate test tubes:
Which row correctly shows the observations made in each test tube?
Test Tube 1: no change; Test Tube 2: precipitate
Test Tube 1: effervescence; Test Tube 2: precipitate
Test Tube 1: effervescence; Test Tube 2: no change
Test Tube 1: no change; Test Tube 2: no change
3 exam-style questions on OCR A A Level Chemistry Qualitative analysis. Each one has a worked solution and a mark scheme showing where the marks go.