Question

name the mordant used in the gram-staining technique.
iodine
alcohol
safranin
crystal violet

Explanation:

In Gram - staining, the steps are as follows: first, crystal violet is used as the primary stain, then iodine is used as the mordant (it forms a complex with crystal violet to make it more adherent to the bacterial cell wall), alcohol is the decolorizer, and safranin is the counter - stain. So among the given options, iodine is the mordant.

Answer:

A. iodine