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Lanthanides and actinides resemble in...

Lanthanides and actinides resemble in

A

electronoic configuration

B

oxidation state

C

ionization energy

D

formation of complexes.

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A
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What were the main demeris of mendeleev's periodic table? (i)Hydrogen has been places in group I though it resembles to group VII as well (ii)Position of some elements was not justified (iii)Isotopes were not given separate places. (iv)Lanthanides and actinides were not included in the table.

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The f-block elements are those in which the differentiating electron enters the (n-2)f orbital. There are two series of f-block elements corresponding to filling of 4f and 5f-orbitals called lanthanides and actinides respectively. They show different oxidation states depending upon the stability of f^0, f^7 and f^14 configurations, though the principal oxidation state is +3. There is a regular decrease in size of lanthanide ions with increase in atomic number and it is known as lanthanide contraction. As a result of this, the basic character of oxides and hydroxides decreases from first element (La) to last element (Lu). All the actinides are radioactive and therefore, it is difficult to study their chemical nature. Which of the following statements is not true ?

The f-block elements are those in which the differentiating electron enters the (n-2)f orbital. There are two series of f-block elements corresponding to filling of 4f and 5f-orbitals called lanthanides and actinides respectively. They show different oxidation states depending upon the stability of f^0, f^7 and f^14 configurations, though the principal oxidation state is +3. There is a regular decrease in size of lanthanide ions with increase in atomic number and it is known as lanthanide contraction. As a result of this, the basic character of oxides and hydroxides decreases from first element (La) to last element (Lu). All the actinides are radioactive and therefore, it is difficult to study their chemical nature. The atomic numbers of three lanthanide elements X,Y and Z are 65,68 and 70 respectively. The basic character of their hydroxides will decrease as

RESONANCE-D & F-BLOCK ELEMENTS & THEIR IMPORTANT COMPOUNDS -Exercise 1
  1. KMnO(4) is the oxo salt of :

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  2. The solubility of silver bromide in hypo solution (excess) is due to ...

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  3. In dilute alkaline solution,MnO(4)^(-) changes to:

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  4. Cl2 gas is obtained by various reactions select the reactions from the...

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  5. The developer used in photography is an alkaline solution of:

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  6. When acidified solution of K(2)Cr(2)O(7) is shaken with aqeous solutio...

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  7. Which of the following compounds is used as the starting material for ...

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  8. CrO(3) dissolves in aqueous NaOH to give:

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  9. The final product obtained for the following reaction is: KMnO(4)("ex...

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  10. The f-block elements of the periodic table contains those element in w...

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  11. Among the lanthanides the one obtained by synthetic method is

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  12. The most common lanthanoid is :

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  13. Across the lanthanide series , the basicity of the lanthanoide hydroxi...

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  14. Actinides

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  15. The lanthanide contraction is responsible for the fact that

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  16. Lanthanides and actinides resemble in

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  17. Ion Exchange Method

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  18. Match the salts/mixtrues listed in column(I) with their respective nam...

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  19. Match the reactions listed in column(I) with characteristic(s) of the ...

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  20. Match the pairs of complexes/compounds listed in column(I) with the ch...

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