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O-LevelChemistryAtomic Structure5070/22 · May/June 2019 · Q13 Marks

Choose from the particles shown to answer the questions. CH4 Fe2+ H2S NH4+ C1- H+ MnO4- p3- Each particle can be used once, more than once or not at all.

  1. (a)Which particle has only eighteen protons?[1]
  2. (b)Which particle is used to test for a reducing agent?[1]
  3. (c)Which particle is an ion that contains only ten electrons?[1]

Mark scheme

Marking points from the official mark scheme (May/June 2019). The mark or mark type is shown in brackets.

  1. [1] (a) H2S
  2. [1] (b) MnO4
  3. [1] (c) NH4+

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About this question

Topic
Atomic Structure, O-Level Chemistry (syllabus 5070). Structured question, 3 marks.
Source
O-Level Chemistry, May/June 2019 Paper 2 Variant 2, question 1.

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