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E^(@) of Cu is +0.34 V while that of Zn ...

`E^(@)` of Cu is +0.34 V while that of Zn is -0.736 V. Explain.

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The ionisation enthalpy for change Cu(s) to `Cu^(2+)`(aq) ion is very high. It is not compensated by the hydration enthalpy which is quite low. Therefore `E^(@)` of Cu is +ve. In case of Zn(s) the divalent cations `Zn^(2+)(aq)` is stable ( `3d^(10)` configuration ). Therefore `E^(@)` is negative.
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DINESH PUBLICATION-D-AND -F BLOCK ELEMENTS-Short Answer type questions.
  1. Why does not copper liberate hydrogen from acids. ?

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  2. Why E^(@) value of Mn, Ni and Zn are more negative than expected ?

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  3. Why is first ionisation enthalpy of Cr lower than that of Zn ?

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  4. Transition elements show high melting points. Why?

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  5. Out of Cu(2)Cl(2), which is more stable and why ?

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  6. When a brown compound of manganese [A] is treated with HCl, it gives a...

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  7. When Cu^(2+) ion is treated with KI, a white precipitate is formed. Ex...

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  8. Although flurorine is more electronegative than oxygen, but the abilit...

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  9. Although Cr^(3+) and Co^(2+) ions have same number of unpaired electro...

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  10. Ionisation enthalpies of Ce, Pr and Nd are higher than those of Th, Pa...

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  11. Although Zr belongs to 4d and Hf belongs to 5d transition series, but...

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  12. Although +3 oxidation stae is thje characteristic oxidation state of ...

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  13. Explain why does colour of KMnO(4) disappear when oxalic acids is adde...

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  14. When orange solution containing Cr(2)O(7)^(2-) ion is treated with an ...

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  15. A solution of KMnO(4) on reduction yields either a colourless solution...

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  16. The second and third rows of transition elements resemble each other ...

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  17. E^(@) of Cu is +0.34 V while that of Zn is -0.736 V. Explain.

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  18. The halides of transition elements become more covalent with increasin...

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  19. While filling up electron in the atomic orbitals, 4s orbital is filled...

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  20. Reactivity of transition element decreases almost regularly from Sc t...

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