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4 marksAcidic and Basic Character of Organic Compounds

CAPE Chemistry Unit 2 · 2005 · Paper 2 · Question 7(a)(i)

Characteristic properties of transition metals and their complexes.

Explain why anhydrous copper (II) sulphate is a white solid that gradually turns blue upon dropwise addition of water, and dissolves to form a blue solution upon further addition.

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  1. 7(a)(ii)Explain why the gradual addition of concentrated sodium chloride solution to aqueous copper (II) sulphate produces a green solution, which changes to yellow…[3 marks]
  2. 7(b)(i)Determine the formula of the complex ion X.[4 marks]
  3. 7(b)(ii)Draw the shape of the complex ion X.[1 mark]
  4. 7(c)(i)Explain why the oxygen-carrying capacity of haemoglobin is reduced in the presence of carbon monoxide.[4 marks]
  5. 7(c)(ii)Account for why manganate(VII) ions (MnO4-) and dichromate(VI) ions (Cr2O7 2-) are powerful oxidizing agents, using E0 values where appropriate.[4 marks]

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