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Examples of Ionic Compounds

In the crysta...

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In the crystal structure of fe3o4, fe2+ and fe3+ occupy respectively

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F e_{3} O_{4}

has inverse spinel structure. What is not true about this solid?

E_{F e^{3 +} | F e}^{⊖}

E_{F e^{2 +} | F e}^{⊖}

- 0.36 V

- 0.439 V

, respectively, then the value of

E_{F e^{3 +} | F e^{2 +}}^{⊖}

Q. Formula of iron oxide with metal deficiency defect in its crystal is

F e_{0.94} O

. The crystal contains

F e^{2 +} and F e^{3 +}

. The mole percentage of

F e

F e^{3 +}

ion in the crystal is:
[0.77 Mark]

Q. Determine the potential for the cell:

P t | F e^{2}, F e^{3 +} | | C r_{2} O_{7}^{2 +}, C r^{3 +}, H^{+} | P t

[F e^{2 +}]

[F e^{3 +}]

0.5 M

0.75 M

respectively and

[C r_{2} O_{7}^{2 -}], [C r^{3 +}]

[H^{+}]

2 M, 4 M

1 M

respectively, Given:

F e^{3 +} + e^{-} \to F e^{2 +}; E^{\circ} = 0.770 v o l t

14 H^{+} + 6 e^{-} + C r_{2} O_{7}^{2 -} \to 2 C r^{3 +}, 7 H_{2} O; E^{\circ} = 1.35 v o l t

.

Q. Standard electrode potentials of

F e^{2 +} + 2 e^{-} \to F e

F e^{3 +} + 3 e^{-} \to F e

- 0.440 V

- 0.036 V

respectively. The standard electrode potential

(E^{o})

F e^{3 +} + e^{-} \to F e^{2 +}

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