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4 marksGroup VII Elements

CAPE Chemistry Unit 1 · May/June 2023 · Paper 2 · Question 3(h)(ii)

NaZ is a sodium halide that gives a brown solution upon bubbling Cl₂ (which turns blue-black on addition of starch), and gives a yellow precipitate insoluble in aqueous ammonia upon adding AgNO₃.

Explain the reaction taking place in EACH of the tests above. Include balanced equations in your explanation.

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Other parts of this question

  1. 3(a)(i)In Table 3, write the formulae for the oxides of the elements in Period 3, excluding chlorine and argon.[3 marks]
  2. 3(a)(ii)In Table 3, write the oxidation number for the element of EACH oxide in Period 3, excluding chlorine and argon.[3 marks]
  3. 3(a)(iii)Explain the nature and variation of the oxidation numbers for the elements in the oxides in Table 3.[2 marks]
  4. 3(b)Write the equation for the reaction between the oxide of phosphorus and cold water.[2 marks]
  5. 3(g)(i)Which of the halogens bring about the maximum change in oxidation number of sulfur?[1 mark]
  6. 3(g)(ii)Write ONE full ionic equation to represent this change.[1 mark]
  7. 3(h)(i)Identify element Z.[1 mark]

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