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  4. Starch iodide paper is used to test the presence of

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Q. Starch iodide paper is used to test the presence of

VMMC MedicalVMMC Medical 2011

Solution:

An oxidising agent (OA) will accept electrons from $ {{\text{I}}^{-}} $ ion and convert it into $ {{\text{I}}_{2}} $ which gives blue colour with starch. $ Strach+KI+OA\xrightarrow{{}}\underset{\text{blue}\,\text{colour}}{\mathop{Strach+{{I}_{2}}}}\, $