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CSEE (Form 4) Non-Metals and Their Compounds — practice questions

Explore 3 free Non-Metals and Their Compounds questions in CSEE (Form 4) Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Non-Metals and Their Compounds questions and exercises with answers

Showing questions 1–3 of 3.

In the reaction of iron(II) sulphate with chlorine and sulphuric acid, the element oxidised is:Read the answer and worked solution →Oxidised or reduced?Read the answer and worked solution →Spot the false claimRead the answer and worked solution →

Worked practice questions

In the reaction of iron(II) sulphate with chlorine and sulphuric acid, the element oxidised is:

  1. Chlorine
  2. Iron
  3. Oxygen
  4. Hydrogen
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Correct answer: B. Iron

1. Oxidation means an increase in oxidation number. 2. Iron begins as Fe²⁺ in iron(II) sulphate and ends as Fe³⁺ in iron(III) sulphate. 3. That is a rise from 2+ to 3+, so iron is oxidised. 4. Chlorine falls from 0 in Cl₂ to −1 in HCl, so chlorine is reduced, not oxidised. 5. Hydrogen and oxygen keep the same oxidation numbers throughout, so neither is oxidised or reduced. _Source: NECTA CSEE 2022 Chemistry 032, Question 1: Multiple Choice Items, item (viii)_

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Oxidised or reduced?

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Items
  1. Item
    Fe2+ to Fe3+
    Category
    Oxidised
  2. Item
    Number goes up
    Category
    Oxidised
  3. Item
    Loses electrons
    Category
    Oxidised
  4. Item
    Cl 0 to Cl -1
    Category
    Reduced
  5. Item
    Number goes down
    Category
    Reduced
  6. Item
    Gains electrons
    Category
    Reduced
Categories
  1. Item
    Oxidised
  2. Item
    Reduced
Instructions
Tap a change, then whether it is oxidation or reduction.

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Spot the false claim

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Questions
  1. False statement
    Iron going from 2+ to 3+ is reduction
    Statements
    1. Oxidation is an increase in oxidation number
    2. Chlorine going from 0 to -1 is reduction
    3. Iron going from 2+ to 3+ is reduction
  2. False statement
    Density decides the order of distillation
    Statements
    1. Nitrogen has a lower boiling point than oxygen
    2. Air is separated by fractional distillation
    3. Density decides the order of distillation
Instructions
Two statements are true and one is false. Tap the false one.

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