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Assign reasons for the following: (a)...

Assign reasons for the following:
(a) `Ce^(3+)` can easily be oxidised to `Ce^(4+)`
(b) `E^(Theta)` for `Mn^(3+)` | `Mn^(2+)` couple is more positive than `Fe^(3+) | Fe^(2+)`
Explain the following :
(a) Zr and Hf exhibit similar properties.
(b) The colour of `K_2Cr_2O_7` solution changes with the change in pH value of the solution .

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Why do Zr and Hf exhibit similar properties?

Explain the following (a) Zr and Hf exhibit similar properties. (b) Most of the transition elements show large number of oxidation states.

Explain why E^(@) for Mn^(3+)//Mn^(2+) couple is more positive than that for Fe^(3+)//Fe^(2+) (At. Nos. Mn=25,Fe=26)?

When SO_2 gas is passed through acidified K_2Cr_2O_7 solution, the colour of the solution changes to

Colour of acidified K_(2)Cr_(2)O_(7) is not changed by:

Colour of acidified K_(2)Cr_(2)O_(7) is not changed by:

The colour of K_(2)Cr_(2)O_(7) , and Fe^(+2) ions are respectively due to

Give reason for the folloiwng : (a) E_("value")^(@) for Mn^(3+)//Mn^(2+) couple is much more positive than that of Fe^(3+)//Fe^(2+) couple. (b) Sc^(3+) is colourless in aqueous solution whereas Ti^(3+) is coloured.

Why is the value for (Mn^(3+))/(Mn^(2+)) couple much more positive than that for (Cr^(3+))/(Cr^(2+)) or (Fe^(3+))/(Fe^(2+)) ? Explain

Assertion: E^(@) for Mn^(3+)//Mn^(2+) is more positive than Cr^(3+)//Cr^(2+) Reason: The third ionisation energy of Mn is larger than that of Cr .

ICSE-d- AND- f- BLOCK ELEMENTS-EXERCISE (PART-II) (DESCRIPTIVE QUESTIONS)(LONG ANSWER QUESTIONS)
  1. What is lanthanoid contraction? What are the consequences of lanthanoi...

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  2. Why lanthanoids and actinoids are called f-block elements?

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  3. Assign reasons for the following: (a) Ce^(3+) can easily be oxidise...

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  4. Assign reasons for the following: (a) Zn^(2+) salts are white while ...

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  5. Assign reasons for the following : (a) Co^(2+) has higher magnetic ...

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  6. Assign reasons for the following : (b) The ionization energy of 5d e...

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  7. Assign reasons for the following : Write equations for the preparati...

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  8. Assign reasons for the following: Sc^(3+) ion is colourless while Cr...

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  9. Why are Mn^(2+) compounds more stable than Fe^(2+) towards oxidation t...

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  10. Assign reasons for the following: Cu(I) compounds are white and diam...

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  11. Assign reasons for the following: Why is the chemistry of all lantha...

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  12. Assign reasons for the following: What is lanthanoid contraction ? E...

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  13. How and you account for the following : (i) Cabalt (II) is stable in...

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  14. Why Sm^(2+) , Eu^(2+) and Yb^(2+) ions are good reducing agents , but ...

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  15. Compare the properties of lanthanoids and actinoids.

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  16. Given below are the electrode potential values, E^(Theta) for some of ...

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  17. Complete the following chemical reaction equations : (i) Cr(2)O(7)^(...

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  18. Decribe the general trends in the following properties of the first se...

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  19. Assign reasons for each of the following (i) Trasitiono elements exh...

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  20. (a) Complete the following chemical reaction equations : (i) MnO(4(a...

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