The correct answer is: B. Fertilizer
Potassium nitrate is a mineral salt that is used as a fertilizer. It is also known as saltpeter or niter. Potassium nitrate is a white, crystalline solid that is soluble in water. It has a bitter taste and is a strong oxidizing agent.
Potassium nitrate is used as a fertilizer because it provides plants with potassium, which is an essential nutrient for plant growth. Potassium helps plants to produce strong stems and leaves, and it also helps to improve the taste and quality of fruits and vegetables.
Potassium nitrate is also used in explosives, fireworks, and matches. It is also used in some medicines, such as those used to treat heart disease and high blood pressure.
Here is a brief explanation of each option:
- A. Medicine Potassium nitrate is used in some medicines, such as those used to treat heart disease and high blood pressure. However, it is not the most common use for potassium nitrate.
- B. Fertilizer Potassium nitrate is a common fertilizer. It provides plants with potassium, which is an essential nutrient for plant growth.
- C. Salt Potassium nitrate is not a type of salt. Salt is a compound of sodium and chloride ions. Potassium nitrate is a compound of potassium and nitrate ions.
- D. Glass Potassium nitrate is not used in glassmaking. Glass is made from silica, soda ash, and lime.