The E(M^(3+)//M^(2+))^(@) values for Cr,...

The `E_(M^(3+)//M^(2+))^(@)` values for Cr, Mn Fe and Co are -0.41, + 1.57, + 0.77 and +1.97V respectively. For which one of these metals the change in oxidation state form +2 to +3 is easiest ?

`10^(-6)M`

`10^(-7)M`

`10^(-8)M`

none of these

Text Solution

Verified by Experts

The correct Answer is:

`K_(a(HOCN))=(10^(-14))/(10^(-10))=10^(-4)`
`K_(h)=K_(b(OCN^(-)))=10^(-10)rArr" "alpha=sqrt((K_(h))/(C))=sqrt((10^(-10))/(0.01))" ":'alphalt lt0.1," ":.K_(h)=calpha^(2)`
`[OH^(-)]=calpha,[OH^(-)]=0.01xx10^(-4)=10^(-6)M`

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The E_(M^(3+)//M^(2+)^@ values for Cr , Mn, Fe and Co are 0.41, + 1.57 , + 0.77 and +1, 97 V respectively. For which one of these metals the change ub oxidation state from =2 to 3 is easiest :

The E^(o)""_(M^(3+)//M^(2+)) values for Cr, Mn, Fe and Co are –0.41, +1.57,+ 0.77 and + 1.97 V respectively. For which one of these metals the change in oxidation state from +2 to +3 is the easiest?

How many of these metals can show +3 oxidation state also. Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Zn

E^(Theta) value for the couple Cr^(3+)//Cr^(2+) and Mn^(3+)//Mn^(2+) are -0.41 and +1.51 volts respectively. Considering these value select the correct option from the following statements.

If E_(Fe^(3+)//Fe)^(@) and E_(Fe^(2+)//Fe)^(@) are -0.36 V and 0.439 V respectively, then value of E_(Fe^(3+)//Fe^(2+))^(@) is

Given E^(c-)._(Fe^(2+)|Fe) and E^(c-)._(Fe^(3+)|Fe^(2+)) are -0.44 and 0.77V respectively. If Fe^(2+),Fe^(3+) and Fe blocks are kept together, then

E^(c-) for Cr^(3+)+3e^(-) rarr Cr and Cr^(3+)+e^(-) rarr Cr^(2+) are -0.74 V and -0.40V , respectively, E^(c-) for the reaction is Cr^(+2)+2e^(-) rarr Cr

The standard redox potentials for the reactions, MN^(2+) + 2e^(-)to Mn and Mn^(3+) + e^(-) are -1.18V and 1.51V respectively. What is the redox potential for the reaction Mn^(3+)+ 3e^(-) to Mn ?

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^(3+)//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 ?

(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

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