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Why first ionisation enthalpy of Cr is l...

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

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`._(24)Cr= [Ar]3d^(5) 4s^(1)`. It can easily lose electron because that will give stable `d^(5) ` configuration `. _(30)Zn = [Ar] 3d^(10) 4s^(2) `. Electron has to be removed from 4s orbital which is closer to nucleus and is held more strongly.
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PRADEEP-D- AND F-BLOCK ELEMENTS-NCERT EXEMPLAR PROBLEMS(SHORT ANSWER QUESTIONS )
  1. Why does copper not replace hydrogen from acids?

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  2. Why E^(-) values for Mn, Ni and Zn are more negative than expected?

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

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  4. Transition elements show high melting points. Why?

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

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

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  7. When a brown compound of manganese (A) is treated with HCl it gives a ...

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  8. Although fluorine is more electronegative than oxygen, but the ability...

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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 Th, Pa and U. W...

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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 m...

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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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