Which of the following substances is pure?
a. Na2CO3
b.NaHCO3
c.NaCl
d.MgCO3
e.Mg(OH)2
f.H3PO4
g.CaOCl2
h.KMnO4
i.Al(OH)3
j.FeSO4
k.Ca(PO4)2
l.PbS
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Answer:
DIAMOND, SUROSE, HONEY AND AIR
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