Asbestos Types – Acid Resistance of Fibers Among the common commercial asbestos types, which one is generally considered the least resistant to acids in service conditions?

Introduction:
Different asbestos mineral families show different chemical resistances. This question tests recognition that serpentine and amphibole asbestos behave differently in acidic environments relevant to legacy industrial materials selection.

Given Data / Assumptions:

• Comparison across chrysotile (serpentine) and amphibole types such as amosite, tremolite, and anthophyllite.
• Service environment involves potential acid exposure.
• We are asked to identify the fiber that is less acid resistant.

Concept / Approach:

Chrysotile has a sheet silicate structure with brucite like layers, making it more susceptible to acid attack, which readily dissolves magnesium from the structure. Amphibole fibers tend to show better acid resistance under comparable conditions.

Step-by-Step Solution:

Verification / Alternative check:

Materials references on asbestos chemistry report faster acid dissolution rates for chrysotile relative to amphibole asbestos under similar temperatures and concentrations.

Why Other Options Are Wrong:

Tremolite, amosite, and anthophyllite are amphiboles with comparatively higher acid resistance than chrysotile. 'None of these' is incorrect since a valid least resistant fiber has been identified.

Common Pitfalls:

Assuming all asbestos types behave the same; confusing mechanical heat resistance with chemical acid resistance.

Final Answer:

Chrysotile asbestos (serpentine group)