The percentage of calcium phosphate present in bones are
50%
60%
75%
45%
Phossy jaw is caused due to the presence of
Sodium
Chlorine
Phosphorus
Calcium
The melting point of phosphorus is
35°C
60°C
44°C
55°C
Phosphorbronze in an alloy of phosphorus with
Copper and Zinc
Copper and Tin
Copper and Magnesium
Copper and Vanadium
The slag formed in the electrical process of manufacture of phosphorus is
Carbon dioxide
Calcium phosphate
Phosphine
Calcium silicate
The match box contains
Red phosphorus
White phosphorus
Scarlet phosphorus
Violet phosphorus
Phosphoric acid is
Dibasic
Tetrabasic
Monobasic
Tribasic
The temperature of the furnace used for manufacture of phosphorus from calcium phosphate is
1000°C
2000°C
3000°C
1500°C
The compound of phosphorus used as drying agent is
Phosphoric acid
Phosphorus acid
Phosphorus trioxide
Phosphorus pentoxide
The impurities in phosphorus is removed by
Redox reaction
Oxidation
Reduction
Decomposition
