P-Block Elements Ques 261

Question: Superphosphate of lime is

[AMU 1985]

Options:

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

Show Answer

Answer:

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_2SO_4 $

$ Ca_3{{(PO_4)}_2}+2H_2SO_4+5H_2O\to $ $ \underset{\text{Superphosphate of lime}}{\mathop{Ca{{(H_2PO_4)}_2}.2H_2O}}+2CaSO_4.2H_2O $



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