A) calcium phosphide
B) phosphine
C) phosphorus
D) phosphorus pentoxide
Correct Answer: D
Solution :
In electro thermal process, silica is heated with calcium phosphate when phosphorus pentoxide is obtained. It is then reduced by coke in electric furnace to get white phosphorus. \[2C{{a}_{3}}(P{{O}_{4}})+6Si{{O}_{2}}\xrightarrow{\Delta }6CaSi{{O}_{3}}+{{P}_{4}}{{O}_{10}}\] \[{{P}_{4}}{{O}_{10}}+10C\xrightarrow{{}}{{P}_{4}}+10CO\]
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