Potassium nitrate is not used:
- A. as a fertiliser
- B. in medicine ✓
- C. in making gunpowder
- D. as a preservative of meat products
Correct Answer: B. in medicine
Explanation
Potassium nitrate is widely used as a fertilizer, in gunpowder, and as a food preservative (saltpeter), but it is not a primary component in general medicine[cite: 1].
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