Iodine is used to test the presence of ___ .

water

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salt

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starch

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colour

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Solution

The correct option is C
starch

The iodine test is used to test for the presence of starch. Starch turns into an intense "blue-black" colour upon addition of iodine. This test is commonly used to check whether milk is adultered or not. If the milk changes to blue-black colour when iodine is added, it means the milk is adultered with starch.

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Iodine is used to test the presence of starch.

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