Discussion
In starch-iodine test, the starch turns in the following colour on addition of iodine :
Answer: B
In the starch iodine test the starch turns blue on addition of iodine, a deep blue black colour, because iodine enters the helix of the amylose in starch and forms a complex. It is used as a test for starch and, indirectly, for amylase in saliva.
Purple, green and pink are not the colours of this complex. A purple colour is shown by iodine in a non polar solvent, which should not be confused with the starch complex.
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