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Introduction to d and f Block Elements

In which of t...

Question

In which of the following species, the colour is due to charge transfer?
$(I) C r_{2} O_{7}^{2 -} (I I) M n O_{4}^{2 -} (I I I) C r O_{4}^{2 -} (I V) M n O_{4}^{-}$

I, II, III correct

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II, IV correct

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I, III correct

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I, II, III, IV correct

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Solution

The correct option is D I, II, III, IV correct
The deep purple colour of permanganate ion, green colour of $M n O_{4}^{2 -}$ , orange colour of dichromate ion and yellow colour of $C r O_{4}^{2 -}$ is due to ligand to metal charge transfer from oxygen to Mn/Cr.

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Similar questions

(I)

{[M n {(O H)}_{2}]}^{2 -}

(I I)

{M n O}_{4}^{2 -}

(I I I)

{M n O}_{2}

(I V)

{K M n O}_{4}

C r_{2} O_{7}^{2 -} + H^{+} + I^{-} \to C r^{3 +} + I_{2} + H_{2} O

C r_{2} O_{7}^{2 -} + F e_{2}^{+} + H^{+} \to C r^{3 +} + F e^{3 +} + H_{2} O

M n O^{4 -} + S O_{3}^{2 -} + H^{+} \to M n^{2 +} + S O_{4}^{2 -} + H_{2} O

M n O^{4 -} + H^{+} + B r^{-} \to M n^{2 +} + B r_{2} + H_{2} O

M - O

(I)

{C r O}_{4}^{2 -}

(I I)

{M n O}_{4}^{-}

(I I I)

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

C O_{2}

C r O_{4}^{2 -}

C r_{2} O_{7}^{2 -}

C r O_{4}^{2 -} (a q) C O_{2} - - \to C r_{2} O_{7}^{2 -}

K_{2} C r O_{4}

C r O_{4}^{2 -}

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