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
Correct Answer: B
Solution :
Superphosphate of lime - It is a mixture of calcium dihydrogen phosphate and gypsum and is obtained by treating phosphatic rock will conc. \[{{H}_{2}}S{{O}_{4}}\] \[C{{a}_{3}}{{(P{{O}_{4}})}_{2}}+2{{H}_{2}}S{{O}_{4}}+5{{H}_{2}}O\,\to \]\[\underset{\text{Superphosphate of lime}}{\mathop{Ca{{({{H}_{2}}P{{O}_{4}})}_{2}}.2{{H}_{2}}O}}\,+2CaS{{O}_{4}}.2{{H}_{2}}O\]
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