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Question

Osmium tetraoxide is used in

A
Light microscopy
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B
Electron microscopy
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C
Phase contrast microscopy
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D
X-ray diffraction
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Solution

The correct option is B Electron microscopy
Osmium tetroxide is used in electron microscopy. The compound can be used as a fixative and a heavy metal stain. Osmium tetraoxide is a good fixative. They serve as an excellent stain for lipids in membranous structures and vesicles. They help in fixation and preservation of the lipids in the cellular membranes.
Thus, the correct answer is option B.

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