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What is lanthanoid contraction ?...

What is lanthanoid contraction ?

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Regular decrease in atomic radius with increase in atomic number in f-block elements is called lanthanoid contraction.
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(a) How would you account for the following : (i) Cobalt (II) is stable in aqueous solution but in the presence of strong ligands, it is easily oxidised. (ii) The transition metals form interstitial compounds. (iii) Silver halides find use in photography. (b) What is lanthanoid contraction ? Mention its main consequences.

(a) Why do transition elements show variable oxidation states? (i) Name the element showing maximum number of oxidation states among the first series of transition metals from Sc (Z = 21) to Zn (Z = 30). (ii) Name the element which shows only + 3 oxidation state. (b) What is lanthanoid contraction? Name an important alloy which contains some of the lanthanoid metals.

(a) What is Lanthanoids contraction ? (b) What are Interstial compounds ? Give one example (c) Calculate the spin only magnetic moment of M^(2+)(aq) ion [Z=29].

What is meant by lanthanoids contraction ? What effect does it have on the chemistry of element which follow lanthanoids ?

What is meant by 'lanthanoid contraction'?

Does actinoids show actinoid contraction similar to lanthanoid contraction ?

U-LIKE SERIES-THE D-AND F-BLOCK ELEMENTS -VERY SHORT ANSWER QUESTIONS (1 mark each)
  1. In the transition series, with an increase in atomic number, the atomi...

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  2. Write the atomic number of the element in which the filling of 3d subs...

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  3. What is lanthanoid contraction ?

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  4. In permanganate ion, all the bonds between Mn and O are covalent. Give...

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  5. Which is the most stable oxidation state among lanthanoids ?

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  6. State the common characteristic of actinoids and lanthanoids which pla...

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  7. The electronic configuration of an element is 3d^(5) 4s^(2). Write its...

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  8. Why is HCl not used to acidify a permanganate solution in volumetric e...

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  9. Name the metal with tripositive charge represented by the following el...

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  10. The d-electron configuration of Mn^(2+) and Ti^(2+) is d^(5) and d^(2)...

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  11. What is the general formula by which the electronic configuration of t...

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  12. The electronic configuration of an element is 3d^(5)4s^(1). Write its ...

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  13. Out of Cr^(2+) and Cr^(3+), which one is stable in aqueous solution ?

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  14. Why are Zn, Cd and Hg normally not regarded as transition elements ?

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  15. Which is the most stable oxidation state of Ti (Z = 22) in aqueous sol...

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  16. Write the ionic equation representing the oxidising property of acidif...

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  17. Why are compounds of transition metals, generally coloured ?

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  18. The size of the trivalent cation in the lanthanoid series decreases st...

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  19. Why do most transition metal ions exhibit paramagnetism ?

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  20. Why does V(2)O(5) act as catalyst ?

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