Change set
Pick exam & year, then Go.
Question map
Not attempted
Correct
Incorrect
★
Bookmarked
Loading…
Q82
(NDA-I/2026)
Science & Technology › Basic Science (Physics, Chemistry, Biology)
Superphosphate of lime-a phosphate fertilizer-is obtained by the reaction of
Result
Your answer:
—
·
Correct:
B
Explanation
Superphosphate of lime is produced by the reaction of calcium phosphate (found in phosphate rock) with sulphuric acid. The chemical reaction is as follows:
Ca3(PO4)2 + 2H2SO4 + 4H2O → Ca(H2PO4)2 + 2CaSO4·2H2O
This process converts insoluble tricalcium phosphate into monocalcium phosphate [Ca(H2PO4)2], which is water-soluble and easily absorbed by plants. The resulting mixture, which also contains gypsum (calcium sulphate), is known as single superphosphate (SSP). Using nitric acid or hydrochloric acid would produce different products; for instance, nitric acid yields nitrophosphate, which is a different class of fertilizer.
How others answered
Each bar shows the % of students who chose that option.
Green bar = correct answer, blue outline = your choice.
Community Performance
Out of everyone who attempted this question.
0%
got it right
✓ Thank you! We'll review this.