Question

Superphosphate of lime is a mixture of :

• A. primary calcium phosphate and epsom salt
• B. primary magnesium phosphate and epsom salt
• C. primary calcium phosphate
• D. primary calcium phosphate and gypsum

Answer 1

The correct option is D primary calcium phosphate and gypsum

Superphosphate is defined as most important phosphorus fertilizer, derived by action of sulfuric acid on phosphate rock (mostly tribasic calcium phosphate) to produce a mix of gypsum and monobasic calcium phosphate. A mixture of gypsum and monobasic calcium phosphate resulting from the action of sulfuric acid on phosphate rock, used as a fertilizer.