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In alkaline medium, KMnO4 oxidises iodi...

In alkaline medium, `KMnO_4` oxidises iodide ion to

A

`I_2`

B

`I^+`

C

`IO_4^-`

D

`IO_3^-`

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In alkaline medium, thiosulphate ions are oxidised to sulphate ions by MnO_4^- ions. The oxidation number of Mn decreases by ______ units.

(a) (i) Which is stronger reducing agent Cr^(2+) or Fe^(2+) and why? (ii) Explain why Cu^(+) ion is not stable in aqueous solutions. (iii) Explain why Ce^(4+) is a strong oxidising agent. (b) Describe the oxidising property of KMnO_(4) in neutral or faintly alkaline medium for its reaction with iodide ions and thiosulphate ions.

Knowledge Check

  • In acidic medium, KMnO_4 oxidises FeSO_4 solution. Which of the following statements is correct?

    A
    10 mL of 1 N `kMnO_4` solution oxidises 10 mL of 5 N `FeSO_4` solution.
    B
    10 mL of 1 M `KMnO_4` solution oxidises 10 mL of 5 M `FeSO_4` solution.
    C
    10 mL of 1 M `KMnO_4` solution oxidises 10 mL of 1 M `FeSO_4` solution.
    D
    10 mL of 1 N `KMnO_4` solution oxidises 10 mL of 0.1 M `FeSO_4` solution.

  • A : In alkaline medium, KMnO_(4) acts as powerful oxidising agent. R : KMnO_(4) reduces to give Mn^(2+) in alkaline medium.

    A
    If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1).
    B
    If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2).
    C
    If Assertion is true statement but Reason is false, then mark (3).
    D
    If both Assertion and Reason are false statements, then mark (4).

  • In acidic medium, KMnO_(4) oxidises FeSO_(4) solution. Which of the following statements is correct?

    A
    10 ml of 1 N `KMnO_4` solution oxidises 10 ml of 5 N `FeSO_4` solution
    B
    10 ml of 1 M `KMnO_4` solution oxidises 10 ml of 5M `FeSO_4` solution
    C
    10 ml of 1M `KMnO_4` solution oxidises 10 ml of 1 M `FeSO_4` solution
    D
    10 ml of 1 N `KMnO_4` solution oxidises 10 ml of 0.1 M `FeSO_4` solution.

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    In acidic medium KMnO_(4) oxidises FeSO_(4) solution. Which of the following statements is correct?

    0.1 litre of 0.01 M KMnO_(4) is used by 100 mL of H_(2)O_(2) in acidic medium. Volume of same KMnO_(4) required in alkaline medium to oxidise 0.1 litre of some H_(2)O_(2) will be :

    In alkaline medium , KMnO_(4) reacts as follows 2KMnO_(4)+2KOH rarr 2K_(2)MnO_(4)+H_(2)O+O Therefore, the equivalent mass of KMnO_(4) will be

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