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What is lanthanoid contraction? What are...

What is lanthanoid contraction? What are the consequences of lanthanoid contraction?

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The decrease in size with increase in atomic no among lanthanoids iscalled lanthanoid contraction it is due to the fact that 5f,6d and 7s levels are of comparable energies consequences :
(i) similar chemical and physical properties among lanthanoids
(ii) Elements of 2nd and 3rd d series exhibit similar radil
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XII BOARD PREVIOUS YEAR PAPER ENGLISH-XII BOARDS-C.B.S.E CLASS XII
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  2. Assign a reason for each of the following observation : (i) The tran...

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  3. What is lanthanoid contraction? What are the consequences of lanthanoi...

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  4. How would you account for the following? The oxidising power of the...

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  5. How are the following conversions carried out? (i)Propene to propan-...

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  6. Answer the following questions: (i) Why are vitamin A and vitamin C ...

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  7. The density of copper is 8.95 g cm^(-3) .It has a face centred cubic s...

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  8. Some ethylene glycol HOCH(2)CH(2)OH is added to your car cooling syste...

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  9. Hydrogen peroxide H(2)O(2) (aq) decomposes to H(2)O(l) and O(2)(g) in ...

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  10. Define the following terms? (i) Peptization (ii) Reversible Sol

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  11. Write down the IUPAC name for each of the following complex : K(3)[F...

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  12. Draw the structure of optical isomers of each of the following complex...

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  13. Which compound in the following pairs will react faster in SN^(2) reac...

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  14. Write the product of the following reaction : (i) CH(3)-Cl+KCNrarr? ...

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  15. Account for the following : Aniline does not give friedel crafts rea...

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  16. write the names of the monomers of the following polymers: (i) Polyt...

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  17. Explain the following terms with a suitable example for each: (i) Di...

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  18. (a) Define the terms conductivity and molar conductivity for the solut...

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  19. (a) Predict the products of electrolysis in each of the following : ...

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  20. Estimate the minimum potential difference needed to reduce AI(2)O(3) ...

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