An analytical chemist is testing fuel blends to distinguish between heptane (a fossil-derived alkane) and bio-ethanol (a renewable alcohol biofuel) using acidified potassium dichromate(VI) solution.
HeptaneBio-ethanolASolution turns from orange to greenNo colour changeBNo colour changeSolution turns from orange to greenCNo colour changeSolution turns from green to orangeDSolution turns from orange to greenSolution turns from green to orange \begin{array}{|c|l|l|} \hline & \textbf{Heptane} & \textbf{Bio-ethanol} \\ \hline \textbf{A} & \text{Solution turns from orange to green} & \text{No colour change} \\ \hline \textbf{B} & \text{No colour change} & \text{Solution turns from orange to green} \\ \hline \textbf{C} & \text{No colour change} & \text{Solution turns from green to orange} \\ \hline \textbf{D} & \text{Solution turns from orange to green} & \text{Solution turns from green to orange} \\ \hline \end{array} ABCDHeptaneSolution turns from orange to greenNo colour changeNo colour changeSolution turns from orange to greenBio-ethanolNo colour changeSolution turns from orange to greenSolution turns from green to orangeSolution turns from green to orangeWhich row in the table gives the correct test results?
Row A
Row B
Row C
Row D
83 exam-style questions on OCR GCSE Chemistry Organic chemistry. Each one has a worked solution and a mark scheme showing where the marks go.