.......... is used as a colouring agent to colour the slide which is to be observed under the microscope.

Water

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Iodine solution

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Hydrogen peroxide

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Chlorine

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Solution

The correct option is B Iodine solution
Gram staining is the method for the identification of bacteria in which iodine solution is used. Iodine solution is directly applied on specimens, or it can be diluted first. Iodine solution makes a complex with carbohydrate or starch in cell and thus become visible under the microscope due to dark colouration.

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