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The 4d and 5d series of transition metal...

The 4d and 5d series of transition metals have more frequency metal-metal bonding in their compounds than do the 3d metals. Explain.

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In the same group of d-block elements, the 4d and 5d transition elements have larger size than that of 3d element. Thus, the valnece electrons are less tightly held and hence can form metal-metal bond more frequently .( That is why melting point of4d and 5d series as well as enthalpies of atomisationn are higher than those of 3d series ).
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How will you account for the following ? (i) The metallic radii of the third (5d) series of transition metals are virtually the same as those of the corresponding group members of the second (4d) series. (ii) Lanthanoids form primarily +3 ions while actinoids usually have higher oxidation states in their compounds . Among the lanthanoids, Ln(III) compounds are predominant. However, occasionally in solution or in solid state +2 and +4 ions are obtained. Explain.

PRADEEP-D- AND F-BLOCK ELEMENTS-CONCEPTUAL QUESTIONS
  1. Describe giving reason which one of the following pairs has the proper...

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  2. Give reason for the following features of transition metal chemistry: ...

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  3. The 4d and 5d series of transition metals have more frequency metal-me...

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  4. Give reasons for each of the following: (i) Size of trivalent lantha...

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  5. Assign reason for each of the following statement: (i) The largest n...

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  6. (i) Which is a stronger reducing agent Cr^(2+) or Fe^(2+) and why ? ...

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  7. Assign reasons for each of the following : (i) Manganese exhibits th...

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  8. Explain why Zn shown only +2 oxidation state.

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  9. Why is first ionization enthalpy of Cu higher than that of Na ?

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  10. Give reason for the following : (i) Mn shows the highest oxidation s...

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  11. (a) Following are the transition metal ions of 3d series: Ti^(4+),V^...

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  12. Write the formula of different oxides of manganese. What is the oxidat...

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  13. What is the effect of increasing pH on the colour of K(2)Cr(2)O(7) sol...

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  14. In the titratin of Fe^(2+) ions with KMnO(4) in acidic medium, why dil...

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  15. Give the relationship between the equivalent weight and molecular weig...

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  16. Why is it not advisable to dissolve KMnO(4) in conc. H(2)SO(4) ?

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  17. Why in permanganate ion, there is a covalency between Mn and oxygen ?

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  18. When chromite ore FeCr(2)O(4) is fuse with NaOH in presence of air, a ...

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  19. Briefly explain why electronic configuration of lanthanoids are not kn...

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  20. The +3 oxidation states of langthanum ( Z= 57), gadolinium (Z= 64) and...

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