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Potassium nitrate is used in?

  • A.Fertiliser
  • B.Medicine
  • C.Salt
  • D.Glass

Answer: A

Potassium nitrate is used as a fertiliser. It supplies both potassium and nitrogen, and unlike most nitrogen fertilisers it contains no chloride, so it suits salt-sensitive crops such as tobacco, citrus and potato.

Its nitrogen is already in the nitrate form plants take up directly. The same compound, saltpetre, is also the oxidiser in gunpowder.

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