Step 1: Concept
Friability testing measures the resistance of tablets to chipping, crumbling, or breaking during handling and transport.
Step 2: Meaning
The IP and USP provide specific sampling protocols based on the individual weight of the tablet.
Step 3: Analysis
For tablets with a unit weight equal to or less than 650 mg, a sample of whole tablets corresponding to about 6.5 g is taken. If the tablet weighs more than 650 mg, 10 whole tablets are used.
Step 4: Conclusion
Thus, the required quantity for tablets under 650 mg is a sample totaling approximately 6.5 grams.
Final Answer: (A)