Which statement best describes Class A glassware?

• A. It is cheaper than Class B.
• B. It is designed for general purpose use only.
• C. It has larger tolerances than Class B.
• D. It is more accurate and has smaller tolerances than Class B.

Answer: (D)

Class A glassware is meant for precise volumetric measurements and comes with calibration that guarantees tight, well-defined tolerances. The key idea is accuracy and consistency: the actual volume lies very close to the labeled value, with small allowable deviations. This is why the best description is that Class A is more accurate and has smaller tolerances than Class B. Class B glassware is designed for general, less critical use and doesn’t carry the same certification, so its tolerances are looser and its accuracy isn’t guaranteed to the same degree. That’s why the other statements don’t fit: Class A is not cheaper due to certification, it isn’t intended for general-purpose use, and it does not have larger tolerances.