How many protons will be consumed when dichromate ion oxidises `Fe^(2+)ions` in aqueous acidic medium?

Options

A. 4
B. 6
C. 10
D. 14

Answer

D

Explanation

When dichromate ion, oxidises ` Fe^(2+)` ions in aqueous acidic medium to ` Fe^(3+)` , then following reaction takes place :
` Cr_(2) O_(7)^(2-) + 14H^(+) + 6Fe^(2+) to 6 Fe^(3+) + 2Cr^(3+) + 7H_(2) O `
Hence, 14 protons are consumed in the reaction and option (d) is the correct answer .