CSEC Chemistry Paper 3 May/June 2015 - Free CXC Past Paper with Answers

Calculate the number of moles of $KMnO_4$ in $1000 \text{ cm}^3$ of Solution A. (The relative molecular mass of $KMnO_4$ is 158.)

Calculate the number of moles of $KMnO_4$ in the volume of Solution A determined in (a) (ii) above.

Does Solution C meet the required standard? Explain your answer.

Calculate the number of moles of $Fe^{2+}$ originally present in $25 \text{ cm}^3$ of Solution B.

Calculate the number of moles of $Fe^{2+}$ that reacted with the $KMnO_4$ during the titration. ($1 \text{ mol}$ of $KMnO_4$ reacts with $5 \text{ mol}$ of $Fe^{2+}$.)

Calculate the number of moles of $Fe^{2+}$ which reacts with $25 \text{ cm}^3$ of Solution C.

Calculate the number of moles of $Fe^{2+}$ which reacts with $1000 \text{ cm}^3$ of Solution C.

You will be provided with a solid sample labelled D. Carry out the following tests and complete Table 2.

TABLE 2: RESULTS OF TESTS ON SAMPLE D