GK QUESTION#3525
What is the chemical name of saltpetre?
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Answer
A. Potassium nitrate
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Explanation
Saltpetre, or saltpeter, ordinarily means potassium nitrate, KNO₃. It contains K⁺ and NO₃⁻ ions. The related term Chile saltpetre refers to sodium nitrate, so the potassium and sodium salts should be distinguished.