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  1. 7(a)(i)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…[4 marks]
  2. 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]
  3. 7(b)(i)Determine the formula of the complex ion X.[4 marks]
  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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