Thomasslag contains . . . . . . . . % P₂O₅

A. 10%

B. 15%

C. 20%

D. 25%

Answer: Option C

Solution(By Examveda Team)

Thomas slag is a finely powdered basic slag obtained in the Thomas-Gilchrist process. Chemically it is tetra calcium phosphate, Ca₄ (PO₄)₂O, (4CaO·P₂O₅).
It is found as the mineral hilgenstockite, which is formed in industrial phosphate-rich slag. It contains 20% of P₂O₅.