The acid used to convert bone ash to phosphoric acid is
Conc.HCl
Conc.H2SO4
Conc.HNO3
Conc.HClO4
The allotropic form of phosphorus used as rat poison is
Violet phosphorus
Red phosphorus
White phosphorus
Scarlet phosphorus
The melting point of phosphorus is
35°C
60°C
44°C
55°C
The formula of meta phosphoric acid is
H2PO6
H3PO7
HPO3
HPO4
Phosphorite is
3 Ca3(PO4)2 CaCl2
3 Ca3(PO4)2 CaF2
Ca3(PO4)3
H3PO4
The impurities in phosphorus is removed by
Redox reaction
Oxidation
Reduction
Decomposition
Phosphorus burns in air or oxygen to give a dense white fumes of
P2O5
H3PO3
P2O3
The compound of phosphorus used as drying agent is
Phosphoric acid
Phosphorus acid
Phosphorus trioxide
Phosphorus pentoxide
Phosphoric acid is
Dibasic
Tetrabasic
Monobasic
Tribasic
The match box contains
