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{:("Element",Cr,Mn,Fe),(E^(underset(-)(o...

`{:("Element",Cr,Mn,Fe),(E^(underset(-)(o))(M^(2+)//M),-0.90V,-1.18V,-0.4V),(E^(underset(-)(o))(M^(3+)//M^(2+)),-0.41V,+1.57V,+0.8V):}` ltbr. Use this data to comment upon
(i) the stability of `Fe^(3+)` and `Mn^(2+)` in acid solutions,
(ii) The ease with which iron can be oxidised as compared to the similar process for either Cr or Mn metals.

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(i) `Mn^(2+)` is more stable than `Fe^(3+)`
(ii) The order of getitng oxidised is `Mn gt Cr gt Fe`.
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{:("Element",Cr,Mn,Fe),(E^(0)(M^(2+)//M),-0.90V,-1.18V,-0.4V),(E^(0)(M^(3+)//M^(2+)),(-0.41V,+1.57V,+0.8V):} Use this data to comment upon (i) The stability of Fe^(3+) and Mn^(2+) in acid solution. (ii) The ease with which iron can be oxidised as compared to the similar process for either Cr or Mn Metals.

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.

For M^(2+)//M and M^(3+)//M^(2+) system, the E^(@) value of some metals are given : Cr^(2+)//Cr=0.9V,Cr^(3+)//Cr^(2+)=-0.4V Mn^(2+)//Mn=1.2V,Mn^(3+)//Mn^(2+)= +1.5 V Fe^(2+)//Fe=0.4 V, Fe^(3+)//Fe^(2+)= +0.8 V Use this data to comment upon : (a) The stability of Fe^(3+) in acid solution as compared to that of Cr^(3+) or Mn^(3+) (b) The ease with which iron can be oxidised as compared to the similar process for either chromium or manganese metal.

Use the data to answer the following and also justify giving rason: {:(," "Cr," "Mn," "Fe," "Co),(E_(M^(2+)//M)^0,-0.91,-1.18,-0.44,-0.28),(E_(M^(2+)//M^(2+))^0,-0.41,+1.57,+0.77,+1.97):} ( a) Which is a stronger redusing agent in aqueous medium Cr^(2) or Fe^(2+) and why ? ( b) Which is the most stable ion in +2 oxidartion and why ?

For Mn^(3+)//Mn^(2+) system, the E^(0) values for some metals are as follows: Cr^(3+)//Cr^(2+)(-0.4V) , Mn^(3+)//Mn^(2+) (+1.5V) , Fe^(3+)//Fe^(2+)(+0.8V) . Then the relative stabilities of Fe^(3+), Cr^(3+) and Mn^(3+) is :

RESONANCE-D & F-BLOCK ELEMENTS & THEIR IMPORTANT COMPOUNDS -Exercise 1
  1. Name the three factors which determine the stability of a particular o...

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  2. Why is the E^(Theta) value for the Mn^(3+)//Mn^(2+) couple much postiv...

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  3. {:("Element",Cr,Mn,Fe),(E^(underset(-)(o))(M^(2+)//M),-0.90V,-1.18V,-0...

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  4. Which of the following ions would form (i) coloured and (ii) colourles...

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  5. Why Ti^(+4) complexes are diamagnetic?

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  6. A substance is found to have a magnetic moments of 3.9BM.How many unpa...

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  7. Explain giving reason: (a) Transition metals and many of their compo...

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  8. Describe the general characteristics of transition elements with speci...

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  9. Which type of reaction MnO(4)^(2-) shows with aid, dilute-alkali or wa...

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  10. Why KMnO(4) is stored in dark bottle and water happens to it's aidic s...

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  11. Why does AgNO(3) produce a black stain on the skin?

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  12. Why is AgBr used in photography?

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  13. Why it is not advisable KMnO(4) in cold and concentrated H(2)SO(4)?

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  14. What happens when: (a). Green vitriol is strongly heated. (b). Mal...

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  15. State true or false: Reaction of K(2)Cr(2)O(7) with cold and concentra...

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  16. Write balaned chemical equations for: (i) Mixture of K(2)Cr(2)O(7) a...

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  17. What are inner-transition elements? Decide which of the following atom...

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  18. Actinoid contraction is greater from element to element than lanthanoi...

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  19. The chemistry of the actinoid elements is not so smooth as that of the...

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  20. Why Sm^(2+) , Eu^(2+) and Yb^(2+) ions in solution are good reducing a...

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