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2 marksFirst Row Transition Elements

CAPE Chemistry Unit 1 · 2008 · Paper 2 · Question 3(c)

Iron forms a complex ion with cyanide ions (CN⁻). The formula of the complex is [Fe(CN)₆]⁴⁻.

Explain how an aqueous solution of iron(II) sulphate functions as an antidote for cyanide poisoning.

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Other parts of this question

  1. 3(a)(i)Insert arrows in EACH of the boxes in Figure 2 to show the electronic configuration of the species.[5 marks]
  2. 3(a)(ii)a)Explain EACH of the following statements in terms of electronic configurations. Fe²⁺ ions are readily oxidized to Fe³⁺ ions.[3 marks]
  3. 3(a)(ii)b)Explain EACH of the following statements in terms of electronic configurations. Mn²⁺ ions are NOT readily oxidized to Mn³⁺ ions.[1 mark]
  4. 3(a)(ii)c)Explain EACH of the following statements in terms of electronic configurations. Zn is NOT considered to be a transition element.[1 mark]
  5. 3(b)(i)Complete the table below by writing the colour of the species labelled A, B, C and D.[4 marks]
  6. 3(b)(ii)State the reagent used for the conversion in Reaction 1 (D → B).[1 mark]

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