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One mole of acidified K2Cr2O7 on reactio...

One mole of acidified `K_2Cr_2O_7` on reaction with excess KI will liberate …… mole (s) of `I_2`.

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`Cr_(2)O_(7)^(2-) + 6I^(-) + 14H^(+) to 2Cr^(3+) + 7H_(2)O + 3I_(2)`
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