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NDA 2026
Exam
NDA
Year
2026
Subject
General Ability
Chapter
General Science

NDA 2026 · General Ability · General Science

Superphosphate of lime, a phosphate fertilizer, is obtained by the...

Superphosphate of lime, a phosphate fertilizer, is obtained by the reaction of

Options

  1. Acalcium phosphate with sodium hydroxide
  2. Bcalcium phosphate with sulphuric acid
  3. Ccalcium phosphate with hydrogen chloride
  4. Dcalcium phosphate with nitric acid

Correct answer

B. calcium phosphate with sulphuric acid

Step-by-step solution

Superphosphate of lime is a mixture of calcium dihydrogen phosphate and calcium sulphate.

It is prepared by the reaction of calcium phosphate with concentrated sulphuric acid.

Ca3(PO4)2+2H2SO4→Ca(H2PO4)2+2CaSO4Ca_3(PO_4)_2 + 2H_2SO_4 \rightarrow Ca(H_2PO_4)_2 + 2CaSO_4

Answer: calcium phosphate with sulphuric acid
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