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2 marksThe Mole Concept

CAPE Chemistry Unit 1 · May/June 2024 · Paper 2 · Question 3(d)(i)

Acidified potassium manganate(VII) solution is a strong oxidizing agent used in a redox titration to determine the concentration of Fe^2+ in iron tablets.

Describe the changes which occur at the end point of the titration.

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  1. 3(a)(i)Write the formulae of the oxides of the elements of the third period, from sodium to sulfur.[3 marks]
  2. 3(a)(ii)Explain the difference in the oxidation number in the oxides of sodium and aluminium.[3 marks]
  3. 3(a)(iii)a)State the type of bond present in magnesium chloride.[1 mark]
  4. 3(a)(iii)b)State the type of bond present in silicon chloride.[1 mark]
  5. 3(a)(iii)c)State the type of bond present in phosphorus(III) chloride.[1 mark]
  6. 3(a)(iv)With the aid of an equation, describe the reaction of silicon chloride in water.[4 marks]
  7. 3(b)(i)Define the term 'ligand'.[2 marks]
  8. 3(b)(ii)Write the formula of the complex formed between X^3+ and six hydroxide ligands.[1 mark]
  9. 3(b)(iii)State the shape of the complex formed.[1 mark]
  10. 3(b)(iv)Using a suitable diagram, illustrate your answer in (b)(iii).[2 marks]
  11. 3(b)(v)State what is meant by the term 'coordination number', in reference to a complex ion.[2 marks]
  12. 3(c)(i)State the expected observation for the addition of concentrated hydrochloric acid to aqueous copper(II) sulfate.[2 marks]
  13. 3(c)(ii)Write an equation for the reaction which occurs between aqueous copper(II) ions and concentrated hydrochloric acid, and identify the species with the higher…[3 marks]
  14. 3(d)(ii)Write the formula and state the colour of the species formed from the oxidation of Fe^2+ ions.[2 marks]

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