Question
Superphosphate of lime, a phosphate fertilizer, is obtained by the reaction of
NDA
General Ability
General Science
2026
NDA 2026 (Phase 1)
NDA General Ability Question (2026) — Solution
Options
- A. calcium phosphate with sodium hydroxide
- B. calcium phosphate with sulphuric acid
- C. calcium phosphate with hydrogen chloride
- D. calcium phosphate with nitric acid
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. Ca_3(PO_4)_2 + 2H_2SO_4 Ca(H_2PO_4)_2 + 2CaSO_4 Answer: calcium phosphate with sulphuric acid
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