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Actinoid contraction is greater from ele...

Actinoid contraction is greater from element to element than lanthanoid contraction. why?

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The decrease in atomic radii in actinoid elements is greater than lanthanoid contraction because 5f electrons have poor shielding effect as compared to 4f electrons. Therefore, the effect of increased nuclear charge leading to contraction in size is more in case of actinoid elements.
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AAKASH SERIES-D-BLOCK ELEMENTS-OBJECTIVE EXERCISE-4 (ASSERTION (A) & REASON (R) TYPE QUESTIONS )
  1. Actinoid contraction is greater from element to element than lanthanoi...

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  2. (A): Fe^(+3) is more stable than that of Fe^(+2). (R) : Fe^(+3) ion ...

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  3. (A): Sc^(+3) ion in aqueous solutions is colorless (R) : Ions with d...

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  4. (A): The spin only magnetic moment of Sc^(+3) 1.73 BM (R) : The spin...

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  5. (A) Cu^(+) is diamagnetic (R) Ions With d^(10) configuration are dia...

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  6. (A): Transition elements form alloys easily (R) : Transition element...

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  7. (A): Transition elements form alloys very easily. (R): They exhibit ...

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  8. (A): Outermost electronic configuration of Pt is 5d^(9)s^(1) (R) : ...

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  9. (A): Elements of second and third transition series have nearly same a...

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  10. (A) : Transition metals form colored ions (R): They have completely ...

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  11. (A): Magnetic moment of Mn^(+2) is 5.8 B.M (R): Mn^(+2) has five unp...

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  12. (A) : Cu^(+2)(aq) is more stable than Cu^(+)(aq) (R): Heat of hydrat...

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  13. (A): Zn(II) compounds are diamagnetic. (R): Zn(II) has all its elect...

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  14. (A): FeO is basic in character. (R): Oxides of transition metals are...

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  15. (A): Pyrolusite is an ore of manganese. (R) : Formula of pyrolusite ...

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  16. (A): Equivalent mass of K(2)Cr(2)O(7), when it acts as oxidizing agent...

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  17. (A): Ti(IV) in aqueous solutions is colour less. (R): Ti(IV) has no ...

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  18. (A): In alkaline medium, KMnO(4) oxidizes iodides to iodates. (R): K...

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  19. (A): Zr and Hf have nearly equal atomic radii. (R): Zr and Hf belong...

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  20. (A) Scandium is the lightest transition metal, (R) Atomic radius of ...

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  21. (A) The most common oxidation state of lanthanides is + 3. (R) Lanth...

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