Q. Superphosphate of lime is
A) A mixture of normal calcium phosphate and gypsum
B) A mixture of primary calcium phosphate and gypsum
C) Normal calcium phosphate
D) Soluble calcium phosphate
Explanation
(b)
Superphosphate of lime is a mixture of calcium dihydrogen phosphate and gypsum and is obtained by treating phosphatic rock with conc $H_{2}SO_{4}$
${Ca}_{3}\left( PO_{4} \right)_{2} + 2H_{2}SO_{4} + 5H_{2}O \rightarrow Ca\left( H_{2}PO_{4} \right)_{2} \bullet 2H_{2}O + 2CaSO_{4} \bullet 2H_{2}O$
superphosphate of lime
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.