A student collects some of the gas from inside a sealed bag of crisps. The student thinks the gas could be carbon dioxide, nitrogen or oxygen.
The gas puts out a lit splint. When the gas is bubbled through limewater, the limewater stays clear.
Which conclusion is supported by the results?
The gas could be carbon dioxide, because it puts out a lit splint.
The gas is not nitrogen, because nitrogen turns limewater milky.
The gas could be oxygen, because oxygen puts out a lit splint.
The gas is not carbon dioxide, because the limewater stays clear.
107 exam-style questions on OCR GCSE Chemistry 4.2 Identifying the products of chemical reactions, covering 4.2.1 Tests to identify gases, 4.2.2 Tests for aqueous ions and flame tests, and 4.2.3 Instrumental methods of analysis. Each one has a worked solution and a mark scheme showing where the marks go.