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A mixture of starch solution and potassium iodide was placed in a test tube. On adding ...

A mixture of starch solution and potassium iodide was placed in a test tube. On adding dilute tetraoxosulphate (lV) acid and then K2Cr2O7 solutions, a blue-black colour was produced. In this reaction, the?

A. iodide is oxidized
B. tetraoxosulphate (Vl) acid acts as an oxidizing agent
C. starch has been oxidized
D. K2Cr2O7 is oxidized




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