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starch can be used as an indicator for the detection of traces of

$\begin{array}{1 1}(a)\;\text{Protein in blood}\\(b)\;\text{Urea in blood}\\(c)\;I_2\text{ in aq. solution}\\(d)\;\text{Glucose in aq. solution}\end{array} $

1 Answer

$I_2$ in aq. solution
The iodine test is used to test for the presence of starch. Starch turns an intense "blue-black" colour upon addition of aqueous solutions of the triiodide anion, due to the formation of an intermolecular charge-transfer complex. In the absence of starch, the brown colour of the aqueous solution remains.
Hence (c) is the correct answer.
answered Mar 26, 2014 by sreemathi.v
edited Jan 29 by sharmaaparna1

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