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Redox Reactions

Short Answer Type

31.

Define fractional oxidation state(paradox of fractional oxidation state) ?

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32. Define oxidising agent and reducing agent in terms of oxidation number ?

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33. What is meant by disproportionate? Give one example.

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34. Give one example of the substance which can act as oxidising agent as well as reducing agent.

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35.

The compound AgF₂ is unstable compound. However, if formed, the compound acts as a very strong oxidising agent. Why?

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36. Which of the following is not a redox reaction?
$left parenthesis straight i right parenthesis space Na space plus space straight H subscript 2 straight O space space rightwards arrow space space space NaOH space plus space 1 half straight H subscript 2 left parenthesis ii right parenthesis space CaCO subscript 3 space space rightwards arrow space space space CaO space plus space CO subscript 2$

Reduction (ii) is not a redox reaction. Since in the given reaction, no element undergoes a change in oxidation state.

+ 2 + 4 -2 + 2 -2 +4 -2
Ca C O₃ Ca O + C O₂

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37. A metal ion M³⁺ loses 3 electrons. What is its oxidation number ?

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38. For the redox reaction:

MnO subscript 4 superscript minus space plus space straight C subscript 2 straight O subscript 4 superscript 2 minus end superscript space plus space straight H to the power of plus space space space rightwards arrow space space space space Mn to the power of 2 plus end exponent space plus space CO subscript 2 space plus space straight H subscript 2 straight O

the correct stoichiometric coefficient of

space space space space space MnO subscript 4 superscript minus comma space space straight C subscript 2 straight O subscript 4 superscript 2 minus end superscript comma space space straight H to the power of plus

are ?

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39.

What is the oxidation number of iron in Fe₃O₄?

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40.

What is the nature of the reaction which occurs at cathode?

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