Canadian Society for Medical Laboratory Science (CSMLS) Practice Exam

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Which is not a standard sized flask?

25ml
500ml
85ml
1000ml

The correct answer is: 85ml

The flask sizes mentioned, including 25ml, 500ml, and 1000ml, are all standard sizes commonly used in laboratory settings for various applications in chemistry and biological sciences. Standardized flasks often come in sizes that are convenient for measuring, mixing, and preparing solutions, which aids in maintaining consistency across experiments. In contrast, 85ml is not a commonly recognized standard size for laboratory flasks. While it is possible to have flasks of that volume, it does not align with the typical volumetric sizes used in educational or professional laboratories. Therefore, the distinction of being "not a standard sized flask" accurately applies to 85ml, as it does not fit within the conventional series of flask sizes that are predominantly utilized.