THE E0 VALUE FOR Mn3-Mn2- couple is morec positive than Cr3-Cr2- why-

The E0 value is standard electrode potential which depends on ionization energy. Since, Mn+2 ion gets a d5 nbsp;configuration which is half filled and hence t ...

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Standard XII

Chemistry

Electronegativity

THE E0 VALUE ...

Question

THE E⁰ VALUE FOR Mn³⁺/Mn²⁺ couple is morec positive than Cr³⁺/Cr²⁺. why??

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Solution

The E⁰ value is standard electrode potential which depends on ionization energy. Since, Mn⁺²ion gets a d⁵ configuration which is half filled and hence third ionization nergy becomes much higher for the cation and it becoems more stable so it gets a higher positive E⁰ value, while the Cr⁺² ion gets a d⁴ configuration and so it has less E⁰ value.

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Similar questions

Q. (a) Complete the following equations:
(i)

{C r}_{2} O_{7}^{2 -} + 2 O H^{-} \to

(ii)

M n O_{4}^{-} + 4 H^{+} + 3 e^{-} \to

(b) Account for the following:
(i)

Z n

is not considered as a transition element.
(ii) Transition metals form a larger number of complexes.
(iii) The

E^{0}

value for the

{M n}^{3 +} / {M n}^{2 +}

couple is much more positive than that for

{C r}^{3 +} / {C r}^{2 +}

couple.

Q. Account for the following:
(i) In the series Sc to Zn, the enthalpy of atomisation of zinc is the lowest.
(ii)

E^{o}

value for the

M n^{3 +} / M n^{2 +}

couple is much more positive than that for

C r^{3 +} / C r^{2 +}

Q. Account for the following:
(i) Transition metals show variable oxidation states.
(ii)

Z n, C d

and

H g

are soft metals.
(iii)

E^{\circ}

value of the

M n^{3 +} / M n^{2 +}

couple is highly positive

(+ 1.57 V)

as compared to

C r^{3 +} / C r^{2 +}

Q. (a) Account for the following:
(i) Transition metals show variable oxidation states.
(ii) Zn, Cd and Hg are soft metals.
(iii)

E^{o}

value for the

M n^{3 +} / M n^{2 +}

couple is highly positive (+ 1.57 V) as compared to

C r^{3 +} / C r^{2 +}

.
(b) Write one similarity and one difference between the chemistry of lanthanoid and actinoid elements.

Q. Assertion :

E^{\circ}

for

M n^{3 +} / M n^{2 +}

is more positive than

C r^{3} / C r^{2 +}

. Reason: The third ionization energy of

M n

is larger than that of

C r

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THE E0 VALUE FOR Mn3+/Mn2+ couple is morec positive than Cr3+/Cr2+. why??

THE E⁰ VALUE FOR Mn³⁺/Mn²⁺ couple is morec positive than Cr³⁺/Cr²⁺. why??