Q283
Thomasslag contains . . . . . . . . % P2O5
A.
10%
B.
15%
C.
20%
AnswerD.
25%
Answer: Option C
Solution
Answer: Option C
Solution:
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.