Excess $\mathrm{KI}$ and acid are added to $\mathrm{K}{}_2\mathrm{Cr}{}_2\mathrm{O}{}_7$ solution. The number of moles of $\mathrm{I}{}_2$ liberated per mole of $\mathrm{K}{}_2\mathrm{Cr}{}_2\mathrm{O}{}_7$ is

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