H2O2 is added to a mixture of aqueous KI and starch solutions. The mixture after reaction appears :
A
brown
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B
violet
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C
black
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D
blue
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Solution
The correct option is C blue H2O2+2KI+2H+→I2+2H2O+2K+. According to the above redox reaction between H2O2 and KI, iodine gas is released. This iodine gas is responsible for turning starch solution blue.