A mixture contains three liquids, J, K and L, that mix completely.
| Liquid | Boiling point (∘C^\circ\mathrm{C}∘C) |
|---|---|
| J | 65 |
| K | 98 |
| L | 118 |
A student separates the mixture by fractional distillation. At one point, the thermometer at the top of the fractionating column shows a steady reading of 98 ∘C98\,^\circ\mathrm{C}98∘C.
Which statement is correct at this point?
Liquid J is being collected, and liquids K and L are still in the flask.
Liquid L is being collected, because it has the highest boiling point.
Liquid K is being collected, and liquid J is still in the flask.
Liquid K is being collected, and liquid L is still in the flask.
102 exam-style questions on OCR GCSE Chemistry 2.1 Purity and separating mixtures, covering 2.1.1 Pure substances and melting point data, 2.1.2 Relative formula mass and empirical formula, 2.1.3 Formulations as useful mixtures, 2.1.4 Techniques for separating mixtures, and 2.1.5 Chromatography and Rf values. Each one has a worked solution and a mark scheme showing where the marks go.