Answer: NaNO3, KNO3, CaO
Notes: Saltpetre, also spelled Saltpeter, also called Nitre, or Niter, any of three naturally occurring nitrates, distinguished as (1) ordinary saltpetre, or potassium nitrate, KNO3; (2) Chile saltpetre, cubic nitre, or sodium nitrate, NaNO3; and (3) lime saltpetre, wall saltpetre, or calcium nitrate, Ca(NO3)2. Calcium oxide (CaO), commonly known as quicklime or burnt lime, is a widely used chemical compound.
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