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Assertion : Lanthanoids show a limited n...

Assertion : Lanthanoids show a limited number of oxidation states whereas actinoids show a large number of oxidation states. Reason : Energy gap between 4f, 5d and 6s subshells is small whereas that between 5f. 6d and 7s subshells is large.

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MODERN PUBLICATION-d-AND f- BLOCK ELEMENTS-EXERCISE
  1. Assertion : Zn^(2+) and Cu^(2+) are colourless. Reason : Both Zn^(2+) ...

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  2. Assertion : There is a continuous decrease in size among lanthanoids. ...

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  3. Assertion : Lanthanoids show a limited number of oxidation states wher...

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  4. Pt^(4+) is less/more stable than Ni^(4+) .

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  5. Match the element in Column I with the property mentioned in Column II

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  6. Find x in the following figures.

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  7. The answer to each of the following questions is a single- digit-integ...

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  8. The number of electrons present in the 4f-subshell of Gd (Z = 64) is

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  9. Write the iupac name of the compound : Li[Al H4]

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  10. The number of paramagnetic ions among Ti^(3+), Cr^(3+), Ti^(4+), Fe^(2...

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  11. The magnetic moment of a transition metal ion is found to be 4.90 BM. ...

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  12. The oxidation number of Mn in the product of alkaline oxidative fusion...

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  13. In neutral or faintly alkaline solution, 8 moles of permanganate anion...

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  14. Electronic configuration of a transition element X in +3 oxidation s...

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  15. The electronic configuration of Cu (II) is 3d^9 whereas that of Cu (I)...

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  16. Complete the following:

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  17. Generally transition elements form coloured salts due to the presence ...

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  18. On addition of small amount of KMnO4 to concentrated H2SO4, a green oi...

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

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  20. Which of following oxidation state is common for all lanthanide ?

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