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For reaction : Cr(2)O(7)^(-2)+14H^(+)r...

For reaction :
`Cr_(2)O_(7)^(-2)+14H^(+)rarr2Cr^(+3)+7H_(2)O`, How many `e^(-)s` are required

A

3

B

4

C

5

D

6

Text Solution

Verified by Experts

The correct Answer is:
D
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Consider the reaction : Cr_(2)O_(7)^(2-)+14H^(+)+6e^(-) to 2Cr^(3+)+7H_(2)O What is the quantity of electricity in coulombs needed to reduce 1 mole of Cr_(2)O_(7)^(2-) ions ?

ALLEN-REDOX REACTIONS-EXERICSE - 3
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  2. Oxidation number of P in PO(4)^(3-), of S in SO(4)^(2-) and that of Cr...

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  3. What will be the oxidation number of Fe in K(3)[Fe(CN)(6)] :-

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  4. In the reaction 2FeCl(3)+H(2)Srarr2FeCl(2)+2HCl+S

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  5. For the redox reation MnO(4)^(-)+C(2)O(4)^(2-)+H^(+)rarrMn^(2+)CO(2)...

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  6. Which of the following act both as oxidant & reductant :-

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  7. Which of the following reaction is spontaneous oxidation - reduction r...

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  8. For reaction : Cr(2)O(7)^(-2)+14H^(+)rarr2Cr^(+3)+7H(2)O, How many e...

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  9. Oxidising agents have high :-

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  10. The ratio of coefficient of HNO(3), Fe(NO(3))(2) and NH(4)NO(3) in the...

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  11. Oxidation number of chlorine in perchloric acid is :-

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  12. Correct order of oxidising strength is :-

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  13. When S(2)O(8)^(2-) oxidise Fe^(2+) then product formed is :-

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  14. The oxidation state of sulhur in H(2)SO(5) and chromium in K(2)Cr(2)O(...

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  15. How much amount of CuSO(4).5H(2)O required for liberation of 2,55gI(2)...

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  16. When Cl(2) gas reacts with hot and concentrated sodium hydroxide solut...

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  17. In which of the following compounds, nitrogen exhibits highest oxidati...

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  18. K(2)Cr(2)O(7) react with hydrazins to form product. The oxidation stat...

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  19. What is the oxidation state of iron in haemoglobin ?

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  20. Consider the following reaction : xMnO(4)^(-)+yC(2)O(4)^(2-)+zH^(+)...

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