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Electrochemical Series

The E0M3+/M...

Question

The $E {^{0}}_{M^{3 +} / M^{2 +}}$ 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 oxidation state from +2 and +3 is easily?

A

Cr

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B

Mn

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C

Fe

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D

Co

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Solution

The correct option is A Cr
Chromium has the least positive value of standard reduction potential $- 0.41 V$ .

Hence the change in oxidation state from +2 to +3 is easiest for chromium.

Option A is correct.

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Similar questions

E_{M^{3 +} / M^{2 +}}^{0}

values of Cr, Mn, Fe and Co are

- 0.41, + 1.57, + 0.77

+ 1.97 V

respectively. For which one of these metals the change in oxidation state from

+ 2

+ 3

_{M^{3 +} / M^{2 +}}^{o}

values for Cr, Mn, Fe and Co are

- 0.41, + 1.57, + 0.77

+ 1.97

V respectively. For which one of these metals the change in oxidation state from

+ 2

+ 3

E_{M^{3 +} / M^{2 +}}^{o}

C r

M n

F e

C o

- 0.41

+ 1.57

0.77

1.97

respectively. For which one of following metal the change in oxidation state from +2 to +3 is easiest?

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

Z n, C d

H g

are soft metals.
(iii)

E^{\circ}

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

couple is highly positive

(+ 1.57 V)

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}

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.

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