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The yellow colour of chromates changes t...

The yellow colour of chromates changes to orange on acidification due to formation of:

A

`Cr^(3+)`

B

`Cr_(2)O_(3)`

C

`Cr_(2)O_(7)^(2-)`

D

`CrO_(4)^(-)`.

Text Solution

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The correct Answer is:
D
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RESONANCE-D & F-BLOCK ELEMENTS & THEIR IMPORTANT COMPOUNDS -Exercise 1
  1. The colour of transition metal ion is attributed to:

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  2. MnO(4)^(-) is intense pint colour, though Mn is (+7) oxidation state, ...

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  3. The yellow colour of chromates changes to orange on acidification due ...

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  4. Catalytic activity of the transition metals and their compounds can be...

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  5. KMnO(4) is the oxo salt of :

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  6. The solubility of silver bromide in hypo solution (excess) is due to ...

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  7. In dilute alkaline solution,MnO(4)^(-) changes to:

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  8. Cl2 gas is obtained by various reactions select the reactions from the...

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  9. The developer used in photography is an alkaline solution of:

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  10. When acidified solution of K(2)Cr(2)O(7) is shaken with aqeous solutio...

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  11. Which of the following compounds is used as the starting material for ...

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  12. CrO(3) dissolves in aqueous NaOH to give:

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  13. The final product obtained for the following reaction is: KMnO(4)("ex...

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  14. The f-block elements of the periodic table contains those element in w...

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  15. Among the lanthanides the one obtained by synthetic method is

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  16. The most common lanthanoid is :

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  17. Across the lanthanide series , the basicity of the lanthanoide hydroxi...

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  18. Actinides

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  19. The lanthanide contraction is responsible for the fact that

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  20. Lanthanides and actinides resemble in

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