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JEE Main Redox Reactions — practice questions — page 3

Explore 65 free Redox Reactions questions in JEE Main Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Redox Reactions questions and exercises with answers

Showing questions 61–65 of 65.

Redox bingoRead the answer and worked solution →Spot the false ruleRead the answer and worked solution →Key in the oxidation numberRead the answer and worked solution →Oxidised or reduced?Read the answer and worked solution →Balance the redox equationRead the answer and worked solution →

Worked practice questions

Redox bingo

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Clues and terms
  1. Clue
    Adding oxygen or removing hydrogen from a substance.
    Item
    Oxidation
  2. Clue
    Removing oxygen or adding hydrogen to a substance.
    Item
    Reduction
  3. Clue
    The species that accepts electrons and is itself reduced.
    Item
    Oxidant
  4. Clue
    The species that donates electrons and is itself oxidised.
    Item
    Reductant
  5. Clue
    A step written to show the electrons explicitly.
    Item
    Half reaction
  6. Clue
    One element oxidised and reduced in the same reaction.
    Item
    Disprop
  7. Clue
    An atom in a compound replaced by another element.
    Item
    Displacement
  8. Clue
    A cell where the reaction becomes electrical energy.
    Item
    Galvanic cell
  9. Clue
    The bookkeeping number set by a list of stated rules.
    Item
    Oxidation no
Instructions
Read each clue and tap the term it describes.
_Source: syllabus Chemistry Part II, Ch 7 'Redox Reactions'_

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Spot the false rule

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Questions
  1. False statement
    A free element sums to its mass
    Statements
    1. A free element sums to its mass
    2. A compound sums to zero
    3. A polyatomic ion sums to its charge
  2. False statement
    A reductant is itself reduced
    Statements
    1. An oxidant is itself reduced
    2. A reductant is itself reduced
    3. Electrons move from reductant to oxidant
  3. False statement
    Metals take only negative numbers
    Statements
    1. Transition metals show several states
    2. Nonmetals may take either sign
    3. Metals take only negative numbers
  4. False statement
    Decomposition needs no elemental product
    Statements
    1. Decomposition needs no elemental product
    2. Peroxide oxygen disproportionates
    3. Displacement has two categories
Instructions
Two statements are true and one is false. Tap the false one.
_Source: syllabus Chemistry Part II, Ch 7 'Redox Reactions'_

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Key in the oxidation number

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Questions
  1. Answer
    1
    Question
    What is the oxidation number of hydrogen in most of its compounds?
  2. Answer
    -1
    Question
    What is the oxidation number of fluorine in all its compounds?
  3. Answer
    0
    Question
    What is the oxidation number of an element in its free state?
  4. Answer
    4
    Question
    What is the oxidation number of carbon in CO2?
Instructions
Work out each oxidation number and key it in on the pad.
_Source: syllabus Chemistry Unit7 Redox Reactions, 7.3 OXIDATION NUMBER_

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