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The oxidation of iron (II) ion by dichromate ion in acidic solution follows the rate law...

The oxidation of iron (II) ion by dichromate ion in acidic solution follows the rate law

rate = k [Cr2O72−] [Fe2+][H+]

Which of the following statements is correct?

A. If the rate is measured in mol L–1s–1, the units of k are mol–1 L s.

B. Doubling the concentration of each of the three ions will increase the rate by a factor of 8.

C. Doubling the concentration of Cr2O72− will increase the rate by a factor of 4.

D. The rate is second order in Fe2+.

E. An increase in pH will cause an increase in the rate.

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Answer #1

As reation is overall third order

So by doubling each reactants rate increases by factor 8.

(B) is correct option.

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