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Give reasons: E^0 value for Mn^(3+)//M...

Give reasons:
`E^0` value for `Mn^(3+)//Mn^(2+)` couple is much more positive than that for `Fe^(3+)//Fe(2+)`.

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The comparatively high value for Mn Shows that `Mn^(2+) (d)^5` is paricularly stable / Much larger third ionisation energy of Mn (where the required change is from ds to (f)
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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) Iron has higher enthalpy of atomization then that of copper. (c) Sc^(3+) is colourless in aqueous solution whereas Ti^(3+) is coloured.

How would you account for the following? (i)The atomic radii of the metals of the third (5d) series of trasition elements are virtually the same as those of the corresponding members of the second (4d) series. (ii)The E^(@) value for the Mn^(3+)//Mn^(2+) couple is much more positive than that for Cr^(3+)//Cr^(2+) couple or Fe^(3+)//Fe^(2+) couple. (iii)The highest oxidation state of a metal is exhibited in itsoxide or fluoride.

How would you account for the following? (i) The atomic radii of the metals of the third (5d) series of transition elements are virtually the same as those of the corresponding member of the second (4d) serie (ii) The E^(@) value for the Mn^(3+)//Mn^(2+) couple is much more positive than that for Cr^(3+)//Cr^(2+) couple of Fe^(3+)//Fe^(2+) couple. (iii) The highest oxidation state of a metal is exhibited in its oxides or fluoride.

S_(1) : Mn^(2+) compounds more stable than Fe^(2+) towards oxidation to their +3 state. S_(2) : Titanium and copper both in the first series of transition metals exhibits +1 oxidation state most frequently. S_(3) : Cu^(+) ions is stable in aqueous solutions. S_(4) : The E^(0) value for the Mn^(3+)//Mn^(2+) couple much more positive than that for Cr^(3+)//Cr^(2+) or Fe^(3+)//Fe^(2+) ,

(a) Account for the following: (i) Manganese shows maximum number of oxidation states in 3d series? (ii) E^@ value for Mn^(3+)| Mn^(2+) couple is much more positive than that of Cr^(3+)| Cr^(2+) . (iii) Ti^(4+) is colourless whereas V^(4+) is coloured in an aqueous solution. (b) Write the chemical equations for the preparation of KMnO_4 from MnO_2 . Why does purple colour of acidified permanganate solution decolourise when it oxidise Fe^(2+) to Fe^(3+) .

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

(a) why is the E^(Theta) value for the Mn^(3+)//Mn^(2+) couple much more positivethan that for Cr^(3+)//Cr^(2+) or Fe^(3+) // Fe^(2+) ? Explain. (b) What is meant by 'disproportionation' of an oxidation state? Give example.

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