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Why actinoid contraction is more than la...

Why actinoid contraction is more than lanthanoid contraction

A

Energy of 4 f and 5f orbitals are same

B

5 f orbitals are more diffused as compared to 4 f orbitals

C

Actinoids show greater range of oxidation states than lanthanoids

D

Actinoids are highly reactive

Text Solution

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The correct Answer is:
B
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Assign reasons for the following : (i) Cu(I) ion is not known to exist in aqueous solutions. (ii) Transition metals are much harder than the alkali metals. (iii) From element to element, actinoid contraction is greater than the lanthanoid contraction.

Assign reasons for the following : (i) The enthalpies of atomisation of transition elements are high. (ii) The transition metals and many of their compounds act as good catalyst. (iii) From element to element the actinoid contraction is greater than the lanthanoid contraction. (iv) The E^(@) value for the Mn^(3+)//Mn^(2+) couple is much more positive than that for Cr^(3+)//Cr^(2+) . (v) Scandium (Z = 21) does not exhibit variable oxidation states and yet it is regarded as transition element.

What is meant by 'lanthanoid contraction'?

Reason of lanthanoid contraction is

Lanthanide contraction is observed in:

Actinoid contraction is greater from element to element than lanthanoid contraction Why?

The gradual decrease in size (actionoid contraction) is from element to element is greater among the actinoids than that among the lanthanoids (lanthanoid contraction).

The effect of lanthanoid contraction in the lanthanoid series of elements by and large means :

(a) Complete the following chemical equations for reactions : (i) MnO_(4(aq))^(-) + S_(2)O_(3(aq))^(2-) + H_(2)O_((l)) to (ii) Cr_(2)O_(7 (aq))^(2-) + H_(2)S_((g)) + H_((aq))^(+) to (b) Give an explanation for each of the following observations : (i) The gradual decrease in size (actinoid contraction) from element to element is greater among the actinoids than that among the lanthanoids (lanthanoid contraction.) (ii) The greatest number of oxidation states are exhibited by the members in the middle of a transition series. (iii) With the same d-orbitals configuration (d^(4)) Cr^(2+) ion is a reducing agent but Mn^(3+) ion is an oxidising agent .

Give an explanation for each of the following observations: (i) The gradual decrease in size (actinoid con-traction) from element to element is greater among the actinoids than that among the lanthanoids (lanthanoid contraction). (ii) The greater number of oxidation states are exhibited by the members in the middle of a transition series. (iii) With the same d-orbital (d^4) , Cr^(2+) ion is a reducing agent but Mn^(3+) ion is an oxidising agent.

AAKASH INSTITUTE ENGLISH-M0ck test 26-EXAMPLE
  1. The electronic configuration of one of the coinage metals is

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  2. In which compound does vanadium has an oxidation number of +4 ?

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  3. Transition metals and their compounds show catalytic properties becaus...

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  4. The common transition metals in brass and bronze is

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  5. Which group elements of first transition series has the highest parama...

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  6. The product formed by the fusion of MnO2 with KHO in the presence of a...

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  7. The number of equivalent Cr-O bonds in CrO4^(2-) is

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  8. Why actinoid contraction is more than lanthanoid contraction

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  9. CrO3 dissolves in aqueous NaOh to give

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  10. Which of the following can be oxidised by acidified K2Cr2O7 ?

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  11. The most common oxidation state exhibited by lanthanoids and actinoids...

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  12. The paramagnetic lanthanoid ion among the following is

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  13. The nature of CrO and Cr2O3 is respectively

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  14. Identify the incorrect statement with respect to KMnO4

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  15. Consider the following statements (I) Zr^(4+) and Hf^(4+) have almos...

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  16. The reddish brown gas produced by heating KCl with solid K2Cr2O7 and...

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  17. Chromate ion, CrO4^(2-) is

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  18. When KMnO4 reacts with I^- in a slightly alkaline and acidic medium, t...

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  19. Which of the following characteristic is not the point of similarity b...

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  20. When a chromite ore (A) is fused with sodium carbonate in free excess ...

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