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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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Ionisation enthalpy of Cr is lower due to stability of `d^(5)` and the value for Zn is higher because its electron comes out from 4s orbital.
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U-LIKE SERIES-THE D-AND F-BLOCK ELEMENTS -VERY SHORT ANSWER QUESTIONS (1 mark each)
  1. Why is zinc not regarded as a transition element ?

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  2. Copper atom has completely filled d-orbitals in its ground state but i...

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

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  4. What is meant by lanthanoid contraction ?

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  5. Why does copper not replace hydrogen from acids ?

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  6. Why is Bi(V) a stronger oxidant than Sb(V) ?

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  7. Write the outer electronic configuration of Cr atom (Z = 24).

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  8. The electronic configuration of a transition element in +3 oxidation s...

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  9. Which is more basic La(OH)(3) or Lu(OH)(3) ? Why ?

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  10. How is the magnetic moment of a species related to the number of unpai...

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  11. Which property of the transition elements makes them good catalysts ?

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  12. What is the effect of increasing pH on K(2)Cr(2)O(7) solution ?

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  13. Why is third ionisation energy of manganese [Atomic number = 25] unexp...

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  14. Why is electronic configuration 1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(2)3d...

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  15. Name the lanthanoid element which exhibits a +4 oxidation state beside...

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  16. What is the difference between the electronic configurations of lantha...

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  17. State a consequence of lanthanoid contraction shown by transition elem...

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  18. Why is that orange solution of K(2)Cr(2)O(7) turns yellow on adding N...

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  19. Why do most transition metal ions show variable oxidation states ?

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  20. Why is Ce^(4+) in aqueous solution a good oxidising agent?

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