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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?

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प्रश्न

Transition metals can act as catalysts because these can change their oxidation state. How does \[\ce{Fe(III)}\] catalyse the reaction between iodide and persulphate ions?

दीर्घउत्तर
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उत्तर

Reaction between iodide and persulphate ions is:

\[\ce{2I^{-} + S2O^{2-}8 ->[Fe(III)] I2 + 2SO^{2-}4}\]

Role of \[\ce{Fe(III)}\] ions:

\[\ce{2Fe^{3+} + 2I^{-} -> 2Fe^{2+} + I2}\]

\[\ce{2Fe^{2+} + S2O^{2-}8 -> 2Fe^{3+} + 2SO^{2-}4}\]

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अध्याय 8: The d-and f-Block Elements - Multiple Choice Questions (Type - I) [पृष्ठ ११५]

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एनसीईआरटी एक्झांप्लर Chemistry Exemplar [English] Class 12
अध्याय 8 The d-and f-Block Elements
Multiple Choice Questions (Type - I) | Q 70.(a) | पृष्ठ ११५

संबंधित प्रश्न

What are interstitial compounds?


Why do the transition elements have higher enthalpies of atomisation?


How is the variability in oxidation states of transition metals different from that of the non-transition metals? Illustrate with examples.


Describe the oxidising action of potassium dichromate and write the ionic equation for its reaction with iodide.


How would you account for the following:

Cobalt (II) is stable in aqueous solutions, but in the presence of complexing reagents, it is easily oxidised.


What is meant by ‘disproportionation’? 


Calculate the number of unpaired electrons in the following gaseous ions:

Mn3+, Cr3+, V3+ and Ti3+. Which one of these is the most stable in an aqueous solution?


Complete and balance the following chemical equations

`Fe^(2+) + MnO_4^(-) + H^+ ->`


How is potassium dichromate prepared from chrome iron ore?


Two metallic elements A and B have the following standard oxidation potentials: A = 0·40v B = - 0·80v. What would you expect if element A was added to an aqueous salt solution of element B? Give a reason for your answer.


Transition metals with lowest melting point is ______.


Maximum magnetic moment is shown by ____________.


Transition elements show high melting points. Why?


A solution of \[\ce{KMnO4}\] on reduction yields either a colourless solution or a brown precipitate or a green solution depending on pH of the solution. What different stages of the reduction do these represent and how are they carried out?


Assertion: Separation of \[\ce{Zr}\] and \[\ce{Hf}\] is difficult.

Reason: Because \[\ce{Zr}\] and \[\ce{Hf}\] lie in the same group of the periodic table.


Mention the type of compounds formed when small atoms like H, C and N get trapped inside the crystal lattice of transition metals. Also give physical and chemical characteristics of these compounds.


Mention any three processes where transition metals act as catalysts.


It has been observed that first ionization energy of 5 d series of transition elements are higher than that of 3d and 4d series, explain why?


Sodium this sulphate is used in photography because of its:-


‘Spin only’ magnetic moment is the same for which of the following ions?

  1. Ti3+
  2. Cr2+
  3. Mn2+
  4. Fe2+
  5. Sc3+

Choose the most appropriate answer from the options given below:


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