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4 marksFirst Row Transition Elements

CAPE Chemistry Unit 1 · 2010 · Paper 2 · Question 3(c)

When concentrated HCl is added to a pink solution of cobalt(II) chloride, the solution turns blue.

Give an explanation for the observation stated above in terms of the stability constant of the complex ion formed, and write a balanced equation for the reaction.

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Other parts of this question

  1. 3(a)Record in Table 1 the observation expected for EACH of the tests below.[5 marks]
  2. 3(b)(i)Calculate the oxidation number of vanadium in EACH of the following species: VOSO4[3 marks]
  3. 3(b)(ii)Calculate the oxidation number of vanadium in EACH of the following species: VO2+[1 mark]
  4. 3(b)(iii)Calculate the oxidation number of vanadium in EACH of the following species: VO2+[1 mark]
  5. 3(d)Complete Table 2 to show the acid/base character of the oxides of Group IV elements in the +2 oxidation state.[3 marks]

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