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4.0 to 6.0
3.0 to 4.0
0.1 to 1.5
1.5 to 3.0
Percentage of lead in lead pencils is
Peroxyacetyl nitrate is a
Person Who among the following is colourblind cannot distinguish between
Pesticides are used to destroy
Petroleum is found in
pH of human blood is between
Phenol is a raw material used in the manufacture of
Phosgene can be used as
Phosphorus is kept in water as
Photo oxidation process is initiated by -