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(a) Transition metals can act as cataly...

(a) Transition metals can act as catalysts because these can change their oxidation state. How does Fe (III) catalyse the reaction between iodide and persulphate ions?
(b) Mention any three processes where transition metals act as catalysts.

Text Solution

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(a) Reaction between iodide and persulphate ions is
`2I^(-)+S_(2)O_(8)^(2-)overset(Fe(III))rarrI_(2)+2SO_(4)^(2-)`
Role of Fe(III) ions `2Fe^(3+)+2I^(-)rarr2Fe^(2+)+I_(2)`
`2Fe^(2+)+S_(2)O_(8)^(2-)rarr2Fe^(3+)+2SO_(4)^(2-)`
(i) Vanatium (V) oxide used in contact process for oxidation of `SO_(2)` to `SO_(3)`.
Finely divided iron in Haber's process in conversion of `N_(2)` and `H_(2)` to `NH_(3)`.
`MnO_(2)` in preparation of oxygen from `KClO_(3)`.
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(a) Why do transition metals act as good catalysts? (b) Why do transition metals form alloys ? (c) What are coinage metals ?

Give reasons for the following: (a) Transition metals and many of their compounds act as catalysts. (b) Scandium (Z = 21) does not exhibit variable oxidation state and yet it is regarded as a transition element. (c) Write the step involved in the preparation of Na_2CrO_4 from chromite ore.

Knowledge Check

  • Generally transition metals act as catalyst because of

    A
    free valenies
    B
    large surface area
    C
    upaired d-electrons
    D
    All of these

  • Which of the following transition metal ion catalyses the reaction between iodide and persulphate ions?

    A
    Mn(IV)
    B
    Co(III)
    C
    Fe(III)
    D
    V(V)

  • Assertion : Iron(III) catalyses the reaction between iodide and persulphate ions. Reason : Transition metals act as catalysts.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true and reason not is the correct explanation of assertion.
    C
    If assertion is trun but reason is false.
    D
    If both assertion and reason are false.

    • Similar Questions

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    (a) How does permanganate solution react with Fe(II) ions? Write balanced ionic equations for the reaction. (b) Why do transition metals and many of their compounds act as good catalysts?

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