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Acidified potassium dichromate is treate...

Acidified potassium dichromate is treated with hydrogen sulphide, IN this reaction, the oxidation number of chormium :

A

increase from +3 to +6

B

decreases from + 6 to +3

C

remains unchanged

D

decreases from + 6 + 2.

Text Solution

Verified by Experts

The correct Answer is:
B
`Cr_(2)O_(7)^(2-) (+6) to Cr^(3+) (3) `
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MODERN PUBLICATION-CHEMISTRY OF D-AND F-BLOCK ELEMENTS-Multiple Choice Questions (Level -I) Transition metal compounds and their Characteristics
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  2. When potassium dichromate crystals are heated with concentrated sulphu...

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  3. Acidified potassium dichromate is treated with hydrogen sulphide, IN t...

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  4. The oxidation states of Mn in K(2)MnO(4), KMnO(4) and Mn(2)O(7) are re...

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  5. In Cr(2)O(7)^(2-) :

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  6. In a redox reaction, how many moles of electrons are accepted by 1 mol...

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  7. Cr(2)O(3) dissolves in aqueous NaOH in the presence of an oxidant to f...

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  9. Two fo the constituents of German silver are :

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  10. The compound which gives off oxygen on moderate heating is :

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  11. Nessler's reagent is :

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  12. The black oxide of copper (CuO) in attacked by moisture and carbon dio...

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  14. Thomas slag is :

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  15. Blister copper is :

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  16. Iron is obtained on a large scale by reduction of Fe(2)O3 with :

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  17. Which of the following ions exist as dimer ?

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  18. Kl and CuSO(4) solutions when mixed give :

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  19. Ammonium dichromate is used in fireworks. The green coloured blown in ...

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