Question

Phosphorus is manufactured by heating a mixture of ___________ in an electric furnace.

• A. bone ash and coke
• B. bone ash and silica
• C. bone ash, silica and coke
• D. bone ash, common salt and coke

Answer 1

Answer: (C)

bone ash, silica and coke

Phosphorus is manufactured by heating a mixture of bone ash, silica and coke in an electric furnace. The process is electrothermic process and bone ash contains calcium phosphate.
$2C{a}_3(P{O}_4{)}_2+6Si{O}_2\to 6CaSi{O}_3+P_4{O}_{10}$
$P_4{O}_{10}+10C\to P_4+10CO$