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The reason for the greater range of oxid...

The reason for the greater range of oxidation states of actinoids is attributed to

A

actinoid contraction

B

5f, 6d and 7s levels having comparable energies

C

4f and 5d levels being close in energies

D

the radioactive nature of actinoids.

Text Solution

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The correct Answer is:
B
The reason for exhibiting a greater number of variable oxidation states (+3 to +7) by the elements belonging to actinoid family is because of comparable energies of 5f, 6d and 7s orbitals. As a result the electrons present in all these orbitals are available for bonding.
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The reason for greater range of oxidation state in actinoids is attributed to:

(a) When a chromite ore (A) is fused with an aqueous solution of sodium carbonate in free excess of air, a yellow solution of compound (B) is obtained. This solution is filtered and acidified with sulphuric acid to form compound (C). Compound (C) on treatment with solution of KCl gives orange crystals of compound (D). Write the chemical formulae of compounds A to D. (b) Describe the cause of the following variations with reSQPect to lanthanoids and actinoids: (i) Greater range of oxidation states of actinoids as compared to lanthanoids. (ii) Greater actinoid contraction as compared to lanthanoid contraction. (iii) Lower ionisation enthalpy of early actinoids as compared to the early lanthanoids.

How would you account for the following : (i) Many of the transition elements are virtually the same as those of the corresponding members of the second series. (iii) There is a greater range of oxidation states among the actinoids than among the lanthanoids.

There is a greater range of variable oxidation states among the actinoids than among the lanthanoids, Why ?

The main reason for larger number of oxidation states exhibited by the actinoids than the corresponding lanthanoids, is :-

DINESH PUBLICATION-D-AND -F BLOCK ELEMENTS-Select the correct answer
  1. Magnetic moment 2.83 BM is given by which of the following ions? "At...

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  2. Zr(Z=40) and Hf(Z=72) have similar atomic and ionic radii because of:

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  3. Magnetic moment 2.84 BM is given by

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  4. The number of d-electron in Fe^(2+) (Z=26) is not equal to the number ...

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  5. Which of the following transition metals of 4d series has the lowest m...

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  6. Which of the following ions has the same number of unpaired electrons ...

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  7. Among the following paris the maximum, oxidation states is shown by

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  8. Among the transition metals of 3d series, that one that has the highes...

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  9. For the first row transition metals, the E^(@) values are {:(,E^(@),...

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  10. Which one of the following complex has maxmimum magnetic moment value?

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  11. Which one of the following statements is correct when SO(2) is passed ...

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  12. The electronic configuration of Eu (Atomic No. 63), Gd (Atomic No. 64)...

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  13. Which one of the following statements related to lanthanons is incorre...

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  14. Which pair of the following 4d series elements has the same number of ...

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  15. In which of the following actinoid elements, 6d sub-shells is vacant?

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  16. The reason for the greater range of oxidation states of actinoids is a...

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  17. Which of the following ions exhibits d-d transitions and paramagnetism...

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  18. Match the metal ions given in Column I with the spin magnetic moments ...

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  19. Which is least stable in aqueous medium?

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  20. Oxidation state if iron in ferric is

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