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MnO(4)^(-) is of intense pink colour, th...

`MnO_(4)^(-)` is of intense pink colour, though Mn is in (+7) oxidation state, it is due to:

A

d-d transition

B

charge transfer when Mn gives electron to oxygen

C

charge transfer when oxygen gives tis electrons to Mn making it +VI

D

absorption of IR frequencies

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The correct Answer is:
C
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Transition metals usually from coloured complexes and d-d transitions (t_(2g)hArre_(g)) are responsible for colour as the energy difference between t_(2g) and e_(g) lies in visible region. But all the coloured ions are not dut to d-d transition but charge transfer bands also play important roles. Charge transfer bands may be of two types. (i) ligand to metal (CTLM) " "(ii) metal to ligand (CTML). Charge transfer transition always produces intense colour as compared to d-d transition. MnO_(4)^(-) is dark purple coloured though Mn is in (+VII) oxidation state with 3d^(@) configuration

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With O highest possible oxidation state of Mn is

With O highest possible oxidation state of Mn is

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The stable oxidation states of Mn are

Assertion : Solution of Na_(2) CrO_(4) in water is intensely coloured Reason : Oxidation state of Cr in Na_(2) CrO_(4) is + VI .

On oxidation of S_(2)O_(3)^(2-) by MnO_(4)^(-) in neutral aqueous medium, the oxidation state of S would change from :

RESONANCE ENGLISH-D & F-BLOCK ELEMENTS & THEIR IMPORTANT COMPOUNDS -National Standard Examination In chemistry
  1. The compound with the lowest oxidation state is:

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  2. The aqua ion which will be almost colorless is-

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  3. MnO(4)^(-) is of intense pink colour, though Mn is in (+7) oxidation s...

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  4. What happens when (write balanced chemical equations only) Dry chlor...

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  5. Highest magnetic moments, shown by the transition metal ion with the ...

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  6. The compound in which Mn has oxidation state of +3 is

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  7. Lanthanoid contraction is caused due to:

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  8. Which of the following ion is colourless?

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  9. The lanthanide compound which is used as a most powerful liquid laser ...

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  10. Which of the following weighs less when weighed in magnetic field?

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  11. In which of the following compounds, the oxidation number of the start...

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  12. One of the consituents of German silver is

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  13. A mixture of acidified K(2)Cr(2)O(7) and 10% Kl is titrated against a...

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  14. The ions from among the following which are colourless are : (i)Ti^(...

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  15. Bell-metal is an alloy of

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  16. Europium (Eu) and Terbium (Tb) attain stable 4f^(7) configuration by e...

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  17. What happens when lead nitrate reacts with potassium chromate?

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  18. Four statements for Cr and Mn are given below: (i) Cr^(2+) and Mn^(3...

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  19. The incorrect statement for lanthanides among the following statements...

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  20. Which of the following statements is not true for Ce^(3+) and Yb^(3+)?

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