Capillary columns are open tubular columns constructed from which of the following materials?a.Metalb.Fused silicac.Stainless steeld.Glass

Capillary columns, widely used in various chromatographic techniques such as gas chromatography, are primarily constructed from fused silica. This material offers several advantages, including a low background signal, high thermal stability, and flexibility, allowing for longer column lengths and improved resolution in separations.

While metal, stainless steel, and glass can be employed in other types of columns, they do not match the effectiveness and efficiency of fused silica for capillary columns. Glass can be used, but it is less common due to fragility compared to fused silica.

In summary, the correct answer is:

b. Fused silica.