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Out of Fe^(2+), Fe^(3 +), Mn^(2+) and Ti...

Out of `Fe^(2+), Fe^(3 +), Mn^(2+)` and `Ti^(2+)` the least size is of

A

`Mn^(2+)`

B

`Ti^(2+)`

C

`Fe^(2+)`

D

`Fe^(3+)`

Text Solution

Verified by Experts

The correct Answer is:
D
Size increases in the order
`Fe^(3+) lt Fe^(2+) lt Mn^(2+) lt Ti^(2+)` as nuclear changes decreases.
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(i) On the basis of the standard electrode potential values stated for acid solutions, predict whether Ti^(4+) species may be used to oxidise Fe(II) to Fe(III) {:(Ti^(4+) + e^(-) to Ti^(3+), E^(@) = +0.01V), (Fe^(3+) + e^(-) to Fe^(2+), E^(@)= +0.77V):} (ii) Based on the data arrange Fe^(3+), Mn^(2+) " and " Cr^(2+) in the increasing order of stability of +2 oxidation state. (Give a brief reason) E_(Cr^(3+)//Cr^(2+))^(@) = -0.4V E_(Mn^(3+)//Mn^(2+))^(@) = +1.5V E_(Fe^(3+)//Fe^(2+))^(@) = +0.8V

Out of Fe^(2+) and Fe^(3+) ions, which is more stable ?

Write down the number of 3d electrons in each of the following ions: Ti^(2+),V(2+), Cr^(3+),Mn^(2+), Fe^(2+),Fe^(3+),Co^(2+),Ni^(2+) " and " Cu^(2+) . Indicate how would you expect the five 3d orbitals to be occupied for these hydrated ions (octahedral).

For M^(2+)//M and M^(3+)//M^(2+) systems the E^(ϴ) values for some metals are as follows: {:(Cr^(2+)//Cr,-0.9V,Cr^(3)//Cr^(2+),-0.4 " V"),(Mn^(2+)//Mn,-1.2V,Mn^(3+)//Mn^(2+),+1.5 " V"),(Fe^(2+)//Fe,-0.4V,Fe^(3+)//Fe^(2+),+0.8 " V"):} Use this data to comment upon: (i) the stability of Fe^(3+) in acid solution as compared to that of Cr^(3+) or Mn^(3+) and (ii) the ease with which iron can be oxidised as compared to a similar process for either chromium or manganese metal.

MARVEL PUBLICATION-D AND F BLOCK ELEMENTS -TEST YOUR GRASP
  1. Out of Fe^(2+), Fe^(3 +), Mn^(2+) and Ti^(2+) the least size is of

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  2. The number of transition series in the periodic table are

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  3. What is the general electronic configuration of transition elements

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  4. Each transition series contains only 10 elements because

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  5. Which one of the following refers to configuration of transition elem...

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  6. The outer electronic configuration of chromium is

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  7. Which of the following does NOT show different oxidation states?

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  8. Calculate the oxidation number of Mn in KMnO(4) molecule.

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  9. The properties of transition metals are in between the properties of ...

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  10. Which transition metal shows the highest oxidation state ?

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  11. Which of the following would be diamagnetic?

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  12. The element present immediately below Zn in the periodic table in the ...

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  13. Oxidation state of +1 is possible with

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  14. For Sc (2 1), if both 3d and 4s electrons in involved in bonding, the ...

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  15. Which one of the following forms a colourless solution in aqueous medi...

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  16. Which of the following group belongs to transition series ?

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  17. In transition elements, the differentiating electron enters into subs...

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  18. Which of has the highest number of unpaired electrons?

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  19. The range of wavelength of the visible light is

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  20. Which of the following salt give coloured aqueous solution ?

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  21. Sulphide ore of Zinc is

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