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Introduction to Sulphuric Acid

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Question

what happens when K2Cr2O7 is treated with KI?

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Solution

When dichromate reacts with KI in the presence of acid medium it gets oxidised to iodine.
$K_{2} C r_{2} O_{7} + 6 K I + 7 H_{2} S O_{4} \to C r_{2} (S O_{4})_{3} + 4 K_{2} S O_{4} + 3 I_{2} + 7 H_{2} O$

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