Question 8 – Predicting chemical reactions - Questions

A student investigates the displacement reactions of halogens to compare their oxidising abilities.

In Test 1, chlorine water ( $Cl_2(aq)$ ) is added to an aqueous solution of potassium bromide ( $K B r (a q)$ ).

In Test 2, bromine water ( $Br_2(aq)$ ) is added to an aqueous solution of potassium iodide ( $K I (a q)$ ).

To each test tube, cyclohexane is added and the mixture is shaken.

Which row in the table correctly predicts the colour of the upper cyclohexane layer for each test?

\begin{array}{|c|c|c|} \hline & \textbf{Test 1: } Cl_2(aq) + KBr(aq) & \textbf{Test 2: } Br_2(aq) + KI(aq) \\ \hline \textbf{A} & \text{Orange} & \text{Purple} \\ \hline \textbf{B} & \text{Pale green} & \text{Orange} \\ \hline \textbf{C} & \text{Orange} & \text{Orange} \\ \hline \textbf{D} & \text{Purple} & \text{Orange} \\ \hline \end{array}

Predicting chemical reactions Questions

Practise OCR GCSE Chemistry Predicting chemical reactions with exam-style questions for Foundation and Higher tier. 49 questions, matched to the OCR GCSE Chemistry (J248) specification and written in Paper 1 and Paper 2 (Foundation Tier) or Paper 3 and Paper 4 (Higher Tier) style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

A student investigates the displacement reactions of halogens to compare their oxidising abilities.

In Test 1, chlorine water ( $Cl_2(aq)$ ) is added to an aqueous solution of potassium bromide ( $K B r (a q)$ ).

In Test 2, bromine water ( $Br_2(aq)$ ) is added to an aqueous solution of potassium iodide ( $K I (a q)$ ).

To each test tube, cyclohexane is added and the mixture is shaken.

Which row in the table correctly predicts the colour of the upper cyclohexane layer for each test?

\begin{array}{|c|c|c|} \hline & \textbf{Test 1: } Cl_2(aq) + KBr(aq) & \textbf{Test 2: } Br_2(aq) + KI(aq) \\ \hline \textbf{A} & \text{Orange} & \text{Purple} \\ \hline \textbf{B} & \text{Pale green} & \text{Orange} \\ \hline \textbf{C} & \text{Orange} & \text{Orange} \\ \hline \textbf{D} & \text{Purple} & \text{Orange} \\ \hline \end{array}