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p -Block elements - ll — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistryp -Block elements - ll1 Mark
MCQ
Superphosphate of lime is
  • A
    A mixture of normal calcium phosphate and gypsum
  • ✓
    A mixture of primary calcium phosphate and gypsum
  • C
    Normal calcium phosphate
  • D
    Soluble calcium phosphate
✓

Answer

Correct option: B.
A mixture of primary calcium phosphate and gypsum
b
(b) 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 $ $\mathop {Ca{{({H_2}P{O_4})}_2}.2{H_2}O}\limits_{{\rm{Superphosphate\,of \,lime}}} + 2CaS{O_4}.2{H_2}O$

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