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Lanthanoids are :...

Lanthanoids are :

A

14 elements in the seventh period (at. Nos. 90 to 103) that are filling 5f sublevel.

B

14 elements in the sixth period (at. Nos. 58 to 71) that are fiiling 4f sublevel.

C

14 elements in the seventh period (atmoic nos. 58 to 71) that are filling 4f sublevel.

D

14 elements in the sixth period (at nos. 90 to 103) that are filling 4f sublevel.

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The correct Answer is:
C
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MODERN PUBLICATION-CHEMISTRY OF D-AND F-BLOCK ELEMENTS-Multiple Choice Questions (Level-II)
  1. The basic character of transition metal monoxides follow the order :

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  2. The correct order of ionic radii of Y^(3+), La^(3+), Eu^(3+) and Lu^(3...

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  3. Lanthanoids are :

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  4. The number of moles of KMnO(4) reduced by one mole of Kl in alkaline m...

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  5. Four sucessive members of the first two transition elements are listed...

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  6. The aqueous solution containing which one fo the following ions will b...

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  7. Copper sulphate dissolves in excess of KCN to give :

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  8. Which is not correct about the chemistry of 3d and 4f series elements ...

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  9. The approximate percentage of iron in mischmetal is :

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  10. To an acidic solution of anion a few drops of acidified KMnO(4) are ...

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  11. The electronic configuration of transition element "X", is +3, oxidati...

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  12. The magnetic nature of elements depends on the presence of unpaired el...

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  13. Which of the following is amphoteric oxide ? Mn(2)O(7), CrO(3), Cr...

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  14. Gadolinium belongs to 4f series. Its atomic number is 64. Which of the...

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  15. KMnO(4) acts as an oxidising agent in alkaline medium. When alkaline K...

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  16. Although Zirconium belongs to 4d transition series and Hafnium to 5d t...

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  17. Why is HCl not used to make the medium acidic in oxidation reactions ...

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  18. In a reaction K(2)MnO(4) is converted into KMnO(4) The change in the ...

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  19. The stable oxidation state of Ce (Z = 58) is

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  20. In the reaction : CrO(4)^(2-) + X to Cr(2)O(7)^(2-) X is

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