s-Block ElementsHard
Question
Limestone is used in the following manufacturing processes except :
Options
A.Solvay process of sodium carbonates.
B.Le-Blanc process of potassium carbonate.
C.Portland cement.
D.Triple superphosphate of lime from fluoroapatite rock.
Solution
(A) CaCO3 (in lime kiln) 
CaO + CO2.
(B) K2SO4 + CaCO3 + 4C
K2CO3 + CaS + 4CO.
(C) Lime stone is one of the constituent of portland cement.
(D) [Ca5(PO4)3F] or [Ca3(PO4)2.CaF2] + 7H3PO4 + 5H2O → 5Ca(H2PO4)2. H2O + HF.
CaO + CO2.(B) K2SO4 + CaCO3 + 4C
K2CO3 + CaS + 4CO.(C) Lime stone is one of the constituent of portland cement.
(D) [Ca5(PO4)3F] or [Ca3(PO4)2.CaF2] + 7H3PO4 + 5H2O → 5Ca(H2PO4)2. H2O + HF.
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