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Colours in Coordination Compounds

Fe 2+ is oxid...

Question

${F e}^{2 +}$ is oxidised by $M n O_{4}^{-}$ or ${C r}_{2} O_{7}^{2 -}$ in acidic medium. What is new oxidation number of Fe?

A

+ 3

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B

+ 1

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C

+ 2

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D

+ 4

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Solution

The correct option is A $+ 3$
$5 {F e}^{2} + M n O_{4}^{-} p i n k i s h v i o l e t + 8 H^{+} ⟶ {M n}^{2 +} c o l o u r l e s s + 5 {F e}^{3 +} + 4 H_{2} O$ ; $6 {F e}^{2 +} + {C r}_{2} O_{7}^{2 -} o r a n g e + 14 H^{+} ⟶ 6 {F e}^{3 +} + 2 {C r}^{3 +} + 7 H_{2} O$
New oxidation state of iron is $+ 3$ .

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Similar questions

Q. A given amount of

{F e}^{2 +}

x

M n O_{4}^{-}

in acidic medium. Calculate number of moles of

{C r}_{2} O_{7}^{2 -}

required to oxidise same amount in

{F e}^{2 +}

in acidic medium if

x = 5

.

1

F e C_{2} O_{4}

x

{C r}_{2} O_{7}^{2 -}

in acidic medium,

x

2

F e C_{2} O_{4}

x

{C r}_{2} O_{7}^{2 -}

in acidic medium. The value of

x

1

{C r}_{2} O_{7}^{2 -}

oxidises _______ moles of

F e C_{2} O_{4}

in acidic medium.

Q. Give a clear idea about how

{M n O}_{4}^{-} {, C r O}_{4}^{2 -}, {C r}_{2} O_{7}^{2 -}

changes its oxidation state when it is in the acidic, basic and neutral medium.

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