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5 marksFirst Row Transition Elements

CAPE Chemistry Unit 1 · 2021 · Paper 2 · Question 3(d)(ii)

Ammonium vanadate, NH4VO3, is an orange solid. Tests are performed on NH4VO3 and colour changes are observed.

Write the formula of the species formed which is responsible for EACH colour observed in (d)(i) in Table 3.

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Other parts of this question

  1. 3(a)(i)Complete Table 2 by inserting the missing electronic structure (ES) and the oxidation state (OS) for EACH element listed.[5 marks]
  2. 3(a)(ii)Explain the difference between the trend of the first ionization energy for the Group II elements and the first row transition elements.[4 marks]
  3. 3(b)(i)Account for the difference in oxidation state between vanadium and calcium.[4 marks]
  4. 3(b)(ii)Comment on the observation that calcium carbonate is more thermally stable than magnesium carbonate.[2 marks]
  5. 3(c)(i)Explain the observation in terms of the stability constant of the complex ion formed.[3 marks]
  6. 3(c)(ii)Write a balanced equation for the reaction occurring when concentrated HCl is added to a pink solution of cobalt(II) chloride.[2 marks]
  7. 3(d)(i)Complete Table 3 to show the observations expected for EACH of the tests on ammonium vanadate.[5 marks]

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