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5 marksPeriod 3: Sodium to Argon

CAPE Chemistry Unit 1 · 2007 · Paper 2 · Question 6(a)(i)

This section covers chemistry of the elements.

Calculate the oxidation number of the first mentioned element in EACH of the following compounds, and explain the variation in these oxidation numbers: MgCl₂, [Al(OH)₄]⁻, SiF₆²⁻, PO₃³⁻.

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Other parts of this question

  1. 6(b)(i)Explain the terms 'atomic radius' and 'ionic radius'.[5 marks]
  2. 6(b)(ii)Account for the variation in atomic and ionic radii of the elements in Group II.[5 marks]
  3. 6(b)(iii)Account for the variation in the solubility of the sulphate (VI) of the Group II elements.[5 marks]
  4. 6(c)Explain the variation in the acid/base character of the oxides of oxidation state +2 of the elements of Group IV.[5 marks]

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