What is Thomas Slag? Is it Ca4(PO4)2O as Google says Or as appeared in BITSAT 2015 a mixture of Ca3(PO4)2 and CaSiO3

Dear Student,

Thomas Slag is the artificial phosphatic manure which is formed as a by-product of the Bessemer process in the iron and steel industry.
Its chemical composition is "Ca3P2O8·CaO + CaO·SiO2" or "Ca3(PO4)2·CaO + CaSiO3" or "Ca4(PO4)​​​​​​2O + CaSiO3". 
Note that, all these chemical formulas represent the same phosphatic manure.

Hope this clears your doubt.

Regards

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