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1 markFirst Row Transition Elements

CAPE Chemistry Unit 1 · 2013 · Paper 2 · Question 6(c)(ii)

When aqueous copper ions are treated separately with aqueous ammonia and concentrated hydrochloric acid, the complex ions [Cu(NH₃)₄(H₂O)₂]²⁺ and [CuCl₄]²⁻ are formed.

State the name of the shape for a complex ion of the formula [ML₄]ⁿ⁺ where M is the central metal and L represents the ligand.

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Other parts of this question

  1. 6(a)The atomic radii across the first row of transition elements show a gradual decrease. Outline the reasons for this trend.[2 marks]
  2. 6(b)(i)State the FULL electronic configuration for the ions, Ti³⁺; Fe²⁺; Cr³⁺.[3 marks]
  3. 6(b)(ii)Explain, in terms of electronic configuration, why iron(II) is readily converted to iron(III).[2 marks]
  4. 6(c)(i)State the name of the shape for EACH of the complex ions.[2 marks]
  5. 6(d)Explain carefully how the colour is produced.[5 marks]

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