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Give reason for the following Electroni...

Give reason for the following
Electronic configuration of lanthanoids are not known with certainty ?

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`4f 5d ` subshells are very close in energy. +ve electrons can jump from 4f to 5d or vice-versa.
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(a). Why second asnd third transition series elements show similar size? (b). Why electronic configuration of lanthanoids not known with certainty? (c). The electronic configuration of actinide elements are not known with certainty. Explain. (d). Why there is similarties (horizontal and vertical) in successive members of the transition series?

CBSE COMPLEMENTARY MATERIAL-The d- AND f-BLOCK ELEMENTS-Short answer type question
  1. Most of the transition metals do not displace hydrogen from dilute aci...

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  2. Give reason for the following Cu^(+) is not stable in aqueous solutio...

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  3. Give reason for the following The highest oxidation state of a metal ...

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  4. Write electronic configuration of Cu^(+2) and Co^(+2)

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  5. Balance the following equations (a ) MnO(4)^(-) + Fe^(2+) + H^...

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  6. Balance the following equations (b ) Cr(2) O^(2-) + Sn^(2+) + ...

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  7. Give reason for the following Electronic configuration of lanthanoids...

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  8. Zn, Cd, Hg are soft and have low melting point. Explain

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  9. What is the effect of pH on the solution ofK(2)Cr(2) O(4)solution ?

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  10. In the following given elements choose which of them is/are transiti...

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  11. Explain interstitial compounds with a proper example.

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  12. Why are Zn, Cd, Hg volatile metals ? Explain.

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  13. Why is first ionization energy of 5d elements higher than those of 3d ...

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  14. Explain ‘Misch metal’ and write its use.

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  15. The following reactions of HNO(3) with Zn are given : (a ) Zn + "Co...

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  16. The following reactions of HNO(3) with Zn are given : (b) Zn + HN...

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  17. Complete the equations : (a) KMnO(4) overset(4)(to)

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  18. Complete the equations : (b) 3K(2) MnO(4) underset(" ") overset( "...

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  19. Out of Fe and Cu, which one would exhibit higher melting point ?

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  20. Sc, the first member of first transition series does not exhibit varia...

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