Question

According to IP and BP very fine powder is one in which

• A. 90% particles pass through 350# sieve
• B. All particles pass through 350# sieve
• C. 90% particles are of size < 10 μm
• D. All particles pass through 120# sieve

Answer 1

The Correct Option is D

To determine the correct answer for the question regarding the definition of "very fine powder" according to the Indian Pharmacopoeia (IP) and British Pharmacopoeia (BP), it's important to understand the standards set by these pharmacopeias for powders.

Let's analyze the options given:

1. 90% particles pass through 350# sieve: This describes a powder that is quite fine, but not all the particles pass through the 350# sieve. This option describes a fine powder, but it's not the strictest standard given.
2. All particles pass through 350# sieve: This would indicate an even finer powder compared to the first option. However, it is not designated as "very fine powder" in IP or BP.
3. 90% particles are of size < 10 μm: This describes a very fine pharmaceutical powder size but isn't specified in the definitions for IP or BP concerning sieves.
4. All particles pass through 120# sieve: According to IP and BP, a "very fine powder" is indeed defined as one where all the particles can pass through a 120# sieve. This is the correct standard applied commonly in pharmacopeias to describe very fine powders.

Based on these analyses and the options, the correct answer is: All particles pass through 120# sieve. This aligns with the understanding of powder classification where "very fine powder" is considered as having all particles small enough to pass through a 120# sieve.