Starch can be used as an indicator for the detection of traces of?
A
Glucose in aqueous solution
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B
Protein in blood
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C
Iodine in aqueous solution
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D
Urea in blood
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Solution
The correct option is C Iodine in aqueous solution The colour of the starch complex is so deep, that it can be detected visually when the concentration of the iodine is aslow as 0.00002 M at 20 °C.