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Give reason for the folloiwng : (a) E(...

Give reason for the folloiwng :
(a) `E_("value")^(@)` for `Mn^(3+)//Mn^(2+)` couple is much more positive than that of `Fe^(3+)//Fe^(2+)` couple.
(b) Iron has higher enthalpy of atomization then that of copper.
(c) `Sc^(3+)` is colourless in aqueous solution whereas `Ti^(3+)` is coloured.

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Sc^(3+) is colourless is aqueous solution whereas Ti^(3+) is coloured.

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Why is the E^(Theta) value for the Mn^(3+)//Mn^(2+) couple much postive than for Cr^(3+)//Cr^(2+) or Fe^(3+)//Fe^(2+) ? Example

MODERN PUBLICATION-D AND F-BLOCK ELEMENTS-REVISION EXERCISES ( SHORT ANSWER QUESTION)
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  2. Calculate the number of unpaired electrons in Cr^(3+) and V^(3+) io...

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  3. How will you account for the following: (a) Actinoids exhibit more num...

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  4. (i) What are interstitial compounds ? (ii) Transition metals show good...

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  5. (a) Define transition metals. (b) Why do transition metals form colour...

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  6. (a) What is lanthanoid contraction and write its consequences ? (b) Dr...

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  7. (a) Why are Zn, Cd and Hg not regarded as transition metals? (b) Why d...

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  8. (a) How will you prepare KMnO4 from pyrolusite ore ? (b) Complete the...

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  9. (a) Why do transition metals act as good catalysts? (b) Why do transit...

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  10. (a) Indicate the steps in the preparation of K2Cr2O7 from chromite ore...

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  11. When MnO2 is fused with KOH in the presence of KNO2 as an oxidising ag...

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  12. Give reasons for the following: (i) Transition elements and their co...

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  13. Give reasons for the following: (i) Transition metals form alloys....

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  14. How would you account for the following? (i) Cr^(2+) is reducing...

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  15. How would you account for the following ? (i) Among lanthanoids, ...

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  16. Explain the following observations: (i) Many of the transition element...

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  17. Why do the transition elements have higher enthalpies of atomisation? ...

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  18. (a) How would you account for the following: (i) The chemistry of ...

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  19. Complete and balance the following chemical equations: (a) Fe^(2+) ...

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  20. Give reason for the folloiwng : (a) E("value")^(@) for Mn^(3+)//Mn^(...

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