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{:("Element",Cr,Mn,Fe),(E^(0)(M^(2+)//M)...

`{:("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.

Text Solution

Verified by Experts

The correct Answer is:
(i) `Mn^(2+)` is more stable than `Fe^(3+)` ,(ii) The order of getting oxidised is `Mngt CrgtFe`.
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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 ?

{:(E_(M^(2+)//M)^(@),Cr,Mn, Fe, Co, Ni, Cu),(,-0.91,-1.18,-0.44,-0.28,-0.25,+0.34):} From the given data of E^(@) values, answer the following questions : (i) Why is E_((Cu^(2+)//Cu))^(@) value exceptionally positive ? (ii) Why is E_((M^(2+)//M))^(@) vlue highly negative as compared to other elements ? (iii) Which is a stronger reducing agent , Cr^(2+) or Fe^(2+) ? Give reason.

E^(@)_(Na^(+)//Na)=-2.71V E^(@)_(Mg^(+2)//Mg)=-2.37V E^(@)_(Fe^(+2)//Fe)=-0.44V, E^(@)_(Cr^(+)//Mg)=-0.41V Based on this date which is th poorest reducing agent?

RESONANCE-D BLOCK ELEMENTS-EXERCISE-I PART-I
  1. Why is the value for (Mn^(3+))/(Mn^(2+)) couple much more positive tha...

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  2. Most of transition , metals can display hydrogen from dilute acid. Why...

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  3. {:("Element",Cr,Mn,Fe),(E^(0)(M^(2+)//M),-0.90V,-1.18V,-0.4V),(E^(0)(M...

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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) complex are diamagnetic?

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  6. A substance is found to hav a magnetic moments of 3.9BM.How many unpai...

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  7. Why do Mn(II) show maximum paramagnetic character amongst the bivalent...

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  8. Explain gives reason. (a) Transition metal and many of their compoun...

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  9. Explain why transition metals and their many compounds act as goodd ca...

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  10. A transition metal form alloys with other transition elements . Explai...

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  11. Describe The general characteristics of transition elements with speci...

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  12. What happen when CuSO(4) solution is treated with (excess of ammonia...

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  13. What happen when silver nitrate solution is added to Na(2)S(2)O(3) sol...

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  14. What reaction will take place if a silver coin is put in dilute HNO(3)...

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  15. Which type of reaction MnO(4)^(2-)show with acid , dilute -alkali or w...

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  16. Why KMO(4) is stored in dark bottle and what happens to it's acidic so...

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  17. Why does AgNO(3) produced a black stain on the skin?

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  18. Why is AgBr used in photography ?

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  19. Why it is not advisable to dissolve KMnO(4) in cold and concentrated H...

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  20. What happen when: (a) Green Vitriol is strongly heated. , (b) FeSO(4)...

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